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diff --git a/gnu/llvm/unittests/ADT/DenseMapTest.cpp b/gnu/llvm/unittests/ADT/DenseMapTest.cpp
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+++ b/gnu/llvm/unittests/ADT/DenseMapTest.cpp
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+//===- llvm/unittest/ADT/DenseMapMap.cpp - DenseMap unit tests --*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "gtest/gtest.h"
+#include "llvm/ADT/DenseMap.h"
+#include <map>
+#include <set>
+
+using namespace llvm;
+
+namespace {
+
+uint32_t getTestKey(int i, uint32_t *) { return i; }
+uint32_t getTestValue(int i, uint32_t *) { return 42 + i; }
+
+uint32_t *getTestKey(int i, uint32_t **) {
+  static uint32_t dummy_arr1[8192];
+  assert(i < 8192 && "Only support 8192 dummy keys.");
+  return &dummy_arr1[i];
+}
+uint32_t *getTestValue(int i, uint32_t **) {
+  static uint32_t dummy_arr1[8192];
+  assert(i < 8192 && "Only support 8192 dummy keys.");
+  return &dummy_arr1[i];
+}
+
+/// \brief A test class that tries to check that construction and destruction
+/// occur correctly.
+class CtorTester {
+  static std::set<CtorTester *> Constructed;
+  int Value;
+
+public:
+  explicit CtorTester(int Value = 0) : Value(Value) {
+    EXPECT_TRUE(Constructed.insert(this).second);
+  }
+  CtorTester(uint32_t Value) : Value(Value) {
+    EXPECT_TRUE(Constructed.insert(this).second);
+  }
+  CtorTester(const CtorTester &Arg) : Value(Arg.Value) {
+    EXPECT_TRUE(Constructed.insert(this).second);
+  }
+  CtorTester &operator=(const CtorTester &) = default;
+  ~CtorTester() {
+    EXPECT_EQ(1u, Constructed.erase(this));
+  }
+  operator uint32_t() const { return Value; }
+
+  int getValue() const { return Value; }
+  bool operator==(const CtorTester &RHS) const { return Value == RHS.Value; }
+};
+
+std::set<CtorTester *> CtorTester::Constructed;
+
+struct CtorTesterMapInfo {
+  static inline CtorTester getEmptyKey() { return CtorTester(-1); }
+  static inline CtorTester getTombstoneKey() { return CtorTester(-2); }
+  static unsigned getHashValue(const CtorTester &Val) {
+    return Val.getValue() * 37u;
+  }
+  static bool isEqual(const CtorTester &LHS, const CtorTester &RHS) {
+    return LHS == RHS;
+  }
+};
+
+CtorTester getTestKey(int i, CtorTester *) { return CtorTester(i); }
+CtorTester getTestValue(int i, CtorTester *) { return CtorTester(42 + i); }
+
+// Test fixture, with helper functions implemented by forwarding to global
+// function overloads selected by component types of the type parameter. This
+// allows all of the map implementations to be tested with shared
+// implementations of helper routines.
+template <typename T>
+class DenseMapTest : public ::testing::Test {
+protected:
+  T Map;
+
+  static typename T::key_type *const dummy_key_ptr;
+  static typename T::mapped_type *const dummy_value_ptr;
+
+  typename T::key_type getKey(int i = 0) {
+    return getTestKey(i, dummy_key_ptr);
+  }
+  typename T::mapped_type getValue(int i = 0) {
+    return getTestValue(i, dummy_value_ptr);
+  }
+};
+
+template <typename T>
+typename T::key_type *const DenseMapTest<T>::dummy_key_ptr = nullptr;
+template <typename T>
+typename T::mapped_type *const DenseMapTest<T>::dummy_value_ptr = nullptr;
+
+// Register these types for testing.
+typedef ::testing::Types<DenseMap<uint32_t, uint32_t>,
+                         DenseMap<uint32_t *, uint32_t *>,
+                         DenseMap<CtorTester, CtorTester, CtorTesterMapInfo>,
+                         SmallDenseMap<uint32_t, uint32_t>,
+                         SmallDenseMap<uint32_t *, uint32_t *>,
+                         SmallDenseMap<CtorTester, CtorTester, 4,
+                                       CtorTesterMapInfo>
+                         > DenseMapTestTypes;
+TYPED_TEST_CASE(DenseMapTest, DenseMapTestTypes);
+
+// Empty map tests
+TYPED_TEST(DenseMapTest, EmptyIntMapTest) {
+  // Size tests
+  EXPECT_EQ(0u, this->Map.size());
+  EXPECT_TRUE(this->Map.empty());
+
+  // Iterator tests
+  EXPECT_TRUE(this->Map.begin() == this->Map.end());
+
+  // Lookup tests
+  EXPECT_FALSE(this->Map.count(this->getKey()));
+  EXPECT_TRUE(this->Map.find(this->getKey()) == this->Map.end());
+#if !defined(_MSC_VER) || defined(__clang__)
+  EXPECT_EQ(typename TypeParam::mapped_type(),
+            this->Map.lookup(this->getKey()));
+#else
+  // MSVC, at least old versions, cannot parse the typename to disambiguate
+  // TypeParam::mapped_type as a type. However, because MSVC doesn't implement
+  // two-phase name lookup, it also doesn't require the typename. Deal with
+  // this mutual incompatibility through specialized code.
+  EXPECT_EQ(TypeParam::mapped_type(),
+            this->Map.lookup(this->getKey()));
+#endif
+}
+
+// Constant map tests
+TYPED_TEST(DenseMapTest, ConstEmptyMapTest) {
+  const TypeParam &ConstMap = this->Map;
+  EXPECT_EQ(0u, ConstMap.size());
+  EXPECT_TRUE(ConstMap.empty());
+  EXPECT_TRUE(ConstMap.begin() == ConstMap.end());
+}
+
+// A map with a single entry
+TYPED_TEST(DenseMapTest, SingleEntryMapTest) {
+  this->Map[this->getKey()] = this->getValue();
+
+  // Size tests
+  EXPECT_EQ(1u, this->Map.size());
+  EXPECT_FALSE(this->Map.begin() == this->Map.end());
+  EXPECT_FALSE(this->Map.empty());
+
+  // Iterator tests
+  typename TypeParam::iterator it = this->Map.begin();
+  EXPECT_EQ(this->getKey(), it->first);
+  EXPECT_EQ(this->getValue(), it->second);
+  ++it;
+  EXPECT_TRUE(it == this->Map.end());
+
+  // Lookup tests
+  EXPECT_TRUE(this->Map.count(this->getKey()));
+  EXPECT_TRUE(this->Map.find(this->getKey()) == this->Map.begin());
+  EXPECT_EQ(this->getValue(), this->Map.lookup(this->getKey()));
+  EXPECT_EQ(this->getValue(), this->Map[this->getKey()]);
+}
+
+// Test clear() method
+TYPED_TEST(DenseMapTest, ClearTest) {
+  this->Map[this->getKey()] = this->getValue();
+  this->Map.clear();
+
+  EXPECT_EQ(0u, this->Map.size());
+  EXPECT_TRUE(this->Map.empty());
+  EXPECT_TRUE(this->Map.begin() == this->Map.end());
+}
+
+// Test erase(iterator) method
+TYPED_TEST(DenseMapTest, EraseTest) {
+  this->Map[this->getKey()] = this->getValue();
+  this->Map.erase(this->Map.begin());
+
+  EXPECT_EQ(0u, this->Map.size());
+  EXPECT_TRUE(this->Map.empty());
+  EXPECT_TRUE(this->Map.begin() == this->Map.end());
+}
+
+// Test erase(value) method
+TYPED_TEST(DenseMapTest, EraseTest2) {
+  this->Map[this->getKey()] = this->getValue();
+  this->Map.erase(this->getKey());
+
+  EXPECT_EQ(0u, this->Map.size());
+  EXPECT_TRUE(this->Map.empty());
+  EXPECT_TRUE(this->Map.begin() == this->Map.end());
+}
+
+// Test insert() method
+TYPED_TEST(DenseMapTest, InsertTest) {
+  this->Map.insert(std::make_pair(this->getKey(), this->getValue()));
+  EXPECT_EQ(1u, this->Map.size());
+  EXPECT_EQ(this->getValue(), this->Map[this->getKey()]);
+}
+
+// Test copy constructor method
+TYPED_TEST(DenseMapTest, CopyConstructorTest) {
+  this->Map[this->getKey()] = this->getValue();
+  TypeParam copyMap(this->Map);
+
+  EXPECT_EQ(1u, copyMap.size());
+  EXPECT_EQ(this->getValue(), copyMap[this->getKey()]);
+}
+
+// Test copy constructor method where SmallDenseMap isn't small.
+TYPED_TEST(DenseMapTest, CopyConstructorNotSmallTest) {
+  for (int Key = 0; Key < 5; ++Key)
+    this->Map[this->getKey(Key)] = this->getValue(Key);
+  TypeParam copyMap(this->Map);
+
+  EXPECT_EQ(5u, copyMap.size());
+  for (int Key = 0; Key < 5; ++Key)
+    EXPECT_EQ(this->getValue(Key), copyMap[this->getKey(Key)]);
+}
+
+// Test copying from a default-constructed map.
+TYPED_TEST(DenseMapTest, CopyConstructorFromDefaultTest) {
+  TypeParam copyMap(this->Map);
+
+  EXPECT_TRUE(copyMap.empty());
+}
+
+// Test copying from an empty map where SmallDenseMap isn't small.
+TYPED_TEST(DenseMapTest, CopyConstructorFromEmptyTest) {
+  for (int Key = 0; Key < 5; ++Key)
+    this->Map[this->getKey(Key)] = this->getValue(Key);
+  this->Map.clear();
+  TypeParam copyMap(this->Map);
+
+  EXPECT_TRUE(copyMap.empty());
+}
+
+// Test assignment operator method
+TYPED_TEST(DenseMapTest, AssignmentTest) {
+  this->Map[this->getKey()] = this->getValue();
+  TypeParam copyMap = this->Map;
+
+  EXPECT_EQ(1u, copyMap.size());
+  EXPECT_EQ(this->getValue(), copyMap[this->getKey()]);
+
+  // test self-assignment.
+  copyMap = copyMap;
+  EXPECT_EQ(1u, copyMap.size());
+  EXPECT_EQ(this->getValue(), copyMap[this->getKey()]);
+}
+
+TYPED_TEST(DenseMapTest, AssignmentTestNotSmall) {
+  for (int Key = 0; Key < 5; ++Key)
+    this->Map[this->getKey(Key)] = this->getValue(Key);
+  TypeParam copyMap = this->Map;
+
+  EXPECT_EQ(5u, copyMap.size());
+  for (int Key = 0; Key < 5; ++Key)
+    EXPECT_EQ(this->getValue(Key), copyMap[this->getKey(Key)]);
+
+  // test self-assignment.
+  copyMap = copyMap;
+  EXPECT_EQ(5u, copyMap.size());
+  for (int Key = 0; Key < 5; ++Key)
+    EXPECT_EQ(this->getValue(Key), copyMap[this->getKey(Key)]);
+}
+
+// Test swap method
+TYPED_TEST(DenseMapTest, SwapTest) {
+  this->Map[this->getKey()] = this->getValue();
+  TypeParam otherMap;
+
+  this->Map.swap(otherMap);
+  EXPECT_EQ(0u, this->Map.size());
+  EXPECT_TRUE(this->Map.empty());
+  EXPECT_EQ(1u, otherMap.size());
+  EXPECT_EQ(this->getValue(), otherMap[this->getKey()]);
+
+  this->Map.swap(otherMap);
+  EXPECT_EQ(0u, otherMap.size());
+  EXPECT_TRUE(otherMap.empty());
+  EXPECT_EQ(1u, this->Map.size());
+  EXPECT_EQ(this->getValue(), this->Map[this->getKey()]);
+
+  // Make this more interesting by inserting 100 numbers into the map.
+  for (int i = 0; i < 100; ++i)
+    this->Map[this->getKey(i)] = this->getValue(i);
+
+  this->Map.swap(otherMap);
+  EXPECT_EQ(0u, this->Map.size());
+  EXPECT_TRUE(this->Map.empty());
+  EXPECT_EQ(100u, otherMap.size());
+  for (int i = 0; i < 100; ++i)
+    EXPECT_EQ(this->getValue(i), otherMap[this->getKey(i)]);
+
+  this->Map.swap(otherMap);
+  EXPECT_EQ(0u, otherMap.size());
+  EXPECT_TRUE(otherMap.empty());
+  EXPECT_EQ(100u, this->Map.size());
+  for (int i = 0; i < 100; ++i)
+    EXPECT_EQ(this->getValue(i), this->Map[this->getKey(i)]);
+}
+
+// A more complex iteration test
+TYPED_TEST(DenseMapTest, IterationTest) {
+  bool visited[100];
+  std::map<typename TypeParam::key_type, unsigned> visitedIndex;
+
+  // Insert 100 numbers into the map
+  for (int i = 0; i < 100; ++i) {
+    visited[i] = false;
+    visitedIndex[this->getKey(i)] = i;
+
+    this->Map[this->getKey(i)] = this->getValue(i);
+  }
+
+  // Iterate over all numbers and mark each one found.
+  for (typename TypeParam::iterator it = this->Map.begin();
+       it != this->Map.end(); ++it)
+    visited[visitedIndex[it->first]] = true;
+
+  // Ensure every number was visited.
+  for (int i = 0; i < 100; ++i)
+    ASSERT_TRUE(visited[i]) << "Entry #" << i << " was never visited";
+}
+
+// const_iterator test
+TYPED_TEST(DenseMapTest, ConstIteratorTest) {
+  // Check conversion from iterator to const_iterator.
+  typename TypeParam::iterator it = this->Map.begin();
+  typename TypeParam::const_iterator cit(it);
+  EXPECT_TRUE(it == cit);
+
+  // Check copying of const_iterators.
+  typename TypeParam::const_iterator cit2(cit);
+  EXPECT_TRUE(cit == cit2);
+}
+
+// Make sure DenseMap works with StringRef keys.
+TEST(DenseMapCustomTest, StringRefTest) {
+  DenseMap<StringRef, int> M;
+
+  M["a"] = 1;
+  M["b"] = 2;
+  M["c"] = 3;
+
+  EXPECT_EQ(3u, M.size());
+  EXPECT_EQ(1, M.lookup("a"));
+  EXPECT_EQ(2, M.lookup("b"));
+  EXPECT_EQ(3, M.lookup("c"));
+
+  EXPECT_EQ(0, M.lookup("q"));
+
+  // Test the empty string, spelled various ways.
+  EXPECT_EQ(0, M.lookup(""));
+  EXPECT_EQ(0, M.lookup(StringRef()));
+  EXPECT_EQ(0, M.lookup(StringRef("a", 0)));
+  M[""] = 42;
+  EXPECT_EQ(42, M.lookup(""));
+  EXPECT_EQ(42, M.lookup(StringRef()));
+  EXPECT_EQ(42, M.lookup(StringRef("a", 0)));
+}
+
+// Key traits that allows lookup with either an unsigned or char* key;
+// In the latter case, "a" == 0, "b" == 1 and so on.
+struct TestDenseMapInfo {
+  static inline unsigned getEmptyKey() { return ~0; }
+  static inline unsigned getTombstoneKey() { return ~0U - 1; }
+  static unsigned getHashValue(const unsigned& Val) { return Val * 37U; }
+  static unsigned getHashValue(const char* Val) {
+    return (unsigned)(Val[0] - 'a') * 37U;
+  }
+  static bool isEqual(const unsigned& LHS, const unsigned& RHS) {
+    return LHS == RHS;
+  }
+  static bool isEqual(const char* LHS, const unsigned& RHS) {
+    return (unsigned)(LHS[0] - 'a') == RHS;
+  }
+};
+
+// find_as() tests
+TEST(DenseMapCustomTest, FindAsTest) {
+  DenseMap<unsigned, unsigned, TestDenseMapInfo> map;
+  map[0] = 1;
+  map[1] = 2;
+  map[2] = 3;
+
+  // Size tests
+  EXPECT_EQ(3u, map.size());
+
+  // Normal lookup tests
+  EXPECT_EQ(1u, map.count(1));
+  EXPECT_EQ(1u, map.find(0)->second);
+  EXPECT_EQ(2u, map.find(1)->second);
+  EXPECT_EQ(3u, map.find(2)->second);
+  EXPECT_TRUE(map.find(3) == map.end());
+
+  // find_as() tests
+  EXPECT_EQ(1u, map.find_as("a")->second);
+  EXPECT_EQ(2u, map.find_as("b")->second);
+  EXPECT_EQ(3u, map.find_as("c")->second);
+  EXPECT_TRUE(map.find_as("d") == map.end());
+}
+
+struct ContiguousDenseMapInfo {
+  static inline unsigned getEmptyKey() { return ~0; }
+  static inline unsigned getTombstoneKey() { return ~0U - 1; }
+  static unsigned getHashValue(const unsigned& Val) { return Val; }
+  static bool isEqual(const unsigned& LHS, const unsigned& RHS) {
+    return LHS == RHS;
+  }
+};
+
+// Test that filling a small dense map with exactly the number of elements in
+// the map grows to have enough space for an empty bucket.
+TEST(DenseMapCustomTest, SmallDenseMapGrowTest) {
+  SmallDenseMap<unsigned, unsigned, 32, ContiguousDenseMapInfo> map;
+  // Add some number of elements, then delete a few to leave us some tombstones.
+  // If we just filled the map with 32 elements we'd grow because of not enough
+  // tombstones which masks the issue here.
+  for (unsigned i = 0; i < 20; ++i)
+    map[i] = i + 1;
+  for (unsigned i = 0; i < 10; ++i)
+    map.erase(i);
+  for (unsigned i = 20; i < 32; ++i)
+    map[i] = i + 1;
+
+  // Size tests
+  EXPECT_EQ(22u, map.size());
+
+  // Try to find an element which doesn't exist.  There was a bug in
+  // SmallDenseMap which led to a map with num elements == small capacity not
+  // having an empty bucket any more.  Finding an element not in the map would
+  // therefore never terminate.
+  EXPECT_TRUE(map.find(32) == map.end());
+}
+
+}