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diff --git a/gnu/llvm/unittests/Support/MemoryBufferTest.cpp b/gnu/llvm/unittests/Support/MemoryBufferTest.cpp
new file mode 100644
index 00000000000..963dcd91c8b
--- /dev/null
+++ b/gnu/llvm/unittests/Support/MemoryBufferTest.cpp
@@ -0,0 +1,225 @@
+//===- llvm/unittest/Support/MemoryBufferTest.cpp - MemoryBuffer tests ----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements unit tests for the MemoryBuffer support class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+namespace {
+
+class MemoryBufferTest : public testing::Test {
+protected:
+  MemoryBufferTest()
+  : data("this is some data")
+  { }
+
+  void SetUp() override {}
+
+  /// Common testing for different modes of getOpenFileSlice.
+  /// Creates a temporary file with known contents, and uses
+  /// MemoryBuffer::getOpenFileSlice to map it.
+  /// If \p Reopen is true, the file is closed after creating and reopened
+  /// anew before using MemoryBuffer.
+  void testGetOpenFileSlice(bool Reopen);
+
+  typedef std::unique_ptr<MemoryBuffer> OwningBuffer;
+
+  std::string data;
+};
+
+TEST_F(MemoryBufferTest, get) {
+  // Default name and null-terminator flag
+  OwningBuffer MB1(MemoryBuffer::getMemBuffer(data));
+  EXPECT_TRUE(nullptr != MB1.get());
+
+  // RequiresNullTerminator = false
+  OwningBuffer MB2(MemoryBuffer::getMemBuffer(data, "one", false));
+  EXPECT_TRUE(nullptr != MB2.get());
+
+  // RequiresNullTerminator = true
+  OwningBuffer MB3(MemoryBuffer::getMemBuffer(data, "two", true));
+  EXPECT_TRUE(nullptr != MB3.get());
+
+  // verify all 3 buffers point to the same address
+  EXPECT_EQ(MB1->getBufferStart(), MB2->getBufferStart());
+  EXPECT_EQ(MB2->getBufferStart(), MB3->getBufferStart());
+
+  // verify the original data is unmodified after deleting the buffers
+  MB1.reset();
+  MB2.reset();
+  MB3.reset();
+  EXPECT_EQ("this is some data", data);
+}
+
+TEST_F(MemoryBufferTest, NullTerminator4K) {
+  // Test that a file with size that is a multiple of the page size can be null
+  // terminated correctly by MemoryBuffer.
+  int TestFD;
+  SmallString<64> TestPath;
+  sys::fs::createTemporaryFile("MemoryBufferTest_NullTerminator4K", "temp",
+                               TestFD, TestPath);
+  raw_fd_ostream OF(TestFD, true, /*unbuffered=*/true);
+  for (unsigned i = 0; i < 4096 / 16; ++i) {
+    OF << "0123456789abcdef";
+  }
+  OF.close();
+
+  ErrorOr<OwningBuffer> MB = MemoryBuffer::getFile(TestPath.c_str());
+  std::error_code EC = MB.getError();
+  ASSERT_FALSE(EC);
+
+  const char *BufData = MB.get()->getBufferStart();
+  EXPECT_EQ('f', BufData[4095]);
+  EXPECT_EQ('\0', BufData[4096]);
+}
+
+TEST_F(MemoryBufferTest, copy) {
+  // copy with no name
+  OwningBuffer MBC1(MemoryBuffer::getMemBufferCopy(data));
+  EXPECT_TRUE(nullptr != MBC1.get());
+
+  // copy with a name
+  OwningBuffer MBC2(MemoryBuffer::getMemBufferCopy(data, "copy"));
+  EXPECT_TRUE(nullptr != MBC2.get());
+
+  // verify the two copies do not point to the same place
+  EXPECT_NE(MBC1->getBufferStart(), MBC2->getBufferStart());
+}
+
+TEST_F(MemoryBufferTest, make_new) {
+  // 0-sized buffer
+  OwningBuffer Zero(MemoryBuffer::getNewUninitMemBuffer(0));
+  EXPECT_TRUE(nullptr != Zero.get());
+
+  // uninitialized buffer with no name
+  OwningBuffer One(MemoryBuffer::getNewUninitMemBuffer(321));
+  EXPECT_TRUE(nullptr != One.get());
+
+  // uninitialized buffer with name
+  OwningBuffer Two(MemoryBuffer::getNewUninitMemBuffer(123, "bla"));
+  EXPECT_TRUE(nullptr != Two.get());
+
+  // 0-initialized buffer with no name
+  OwningBuffer Three(MemoryBuffer::getNewMemBuffer(321, data));
+  EXPECT_TRUE(nullptr != Three.get());
+  for (size_t i = 0; i < 321; ++i)
+    EXPECT_EQ(0, Three->getBufferStart()[0]);
+
+  // 0-initialized buffer with name
+  OwningBuffer Four(MemoryBuffer::getNewMemBuffer(123, "zeros"));
+  EXPECT_TRUE(nullptr != Four.get());
+  for (size_t i = 0; i < 123; ++i)
+    EXPECT_EQ(0, Four->getBufferStart()[0]);
+}
+
+void MemoryBufferTest::testGetOpenFileSlice(bool Reopen) {
+  // Test that MemoryBuffer::getOpenFile works properly when no null
+  // terminator is requested and the size is large enough to trigger
+  // the usage of memory mapping.
+  int TestFD;
+  SmallString<64> TestPath;
+  // Create a temporary file and write data into it.
+  sys::fs::createTemporaryFile("prefix", "temp", TestFD, TestPath);
+  // OF is responsible for closing the file; If the file is not
+  // reopened, it will be unbuffered so that the results are
+  // immediately visible through the fd.
+  raw_fd_ostream OF(TestFD, true, !Reopen);
+  for (int i = 0; i < 60000; ++i) {
+    OF << "0123456789";
+  }
+
+  if (Reopen) {
+    OF.close();
+    EXPECT_FALSE(sys::fs::openFileForRead(TestPath.c_str(), TestFD));
+  }
+
+  ErrorOr<OwningBuffer> Buf =
+      MemoryBuffer::getOpenFileSlice(TestFD, TestPath.c_str(),
+                                     40000, // Size
+                                     80000  // Offset
+                                     );
+
+  std::error_code EC = Buf.getError();
+  EXPECT_FALSE(EC);
+
+  StringRef BufData = Buf.get()->getBuffer();
+  EXPECT_EQ(BufData.size(), 40000U);
+  EXPECT_EQ(BufData[0], '0');
+  EXPECT_EQ(BufData[9], '9');
+}
+
+TEST_F(MemoryBufferTest, getOpenFileNoReopen) {
+  testGetOpenFileSlice(false);
+}
+
+TEST_F(MemoryBufferTest, getOpenFileReopened) {
+  testGetOpenFileSlice(true);
+}
+
+TEST_F(MemoryBufferTest, reference) {
+  OwningBuffer MB(MemoryBuffer::getMemBuffer(data));
+  MemoryBufferRef MBR(*MB);
+
+  EXPECT_EQ(MB->getBufferStart(), MBR.getBufferStart());
+  EXPECT_EQ(MB->getBufferIdentifier(), MBR.getBufferIdentifier());
+}
+
+TEST_F(MemoryBufferTest, slice) {
+  // Create a file that is six pages long with different data on each page.
+  int FD;
+  SmallString<64> TestPath;
+  sys::fs::createTemporaryFile("MemoryBufferTest_Slice", "temp", FD, TestPath);
+  raw_fd_ostream OF(FD, true, /*unbuffered=*/true);
+  for (unsigned i = 0; i < 0x2000 / 8; ++i) {
+    OF << "12345678";
+  }
+  for (unsigned i = 0; i < 0x2000 / 8; ++i) {
+    OF << "abcdefgh";
+  }
+  for (unsigned i = 0; i < 0x2000 / 8; ++i) {
+    OF << "ABCDEFGH";
+  }
+  OF.close();
+
+  // Try offset of one page.
+  ErrorOr<OwningBuffer> MB = MemoryBuffer::getFileSlice(TestPath.str(),
+                                                        0x4000, 0x1000);
+  std::error_code EC = MB.getError();
+  ASSERT_FALSE(EC);
+  EXPECT_EQ(0x4000UL, MB.get()->getBufferSize());
+ 
+  StringRef BufData = MB.get()->getBuffer();
+  EXPECT_TRUE(BufData.substr(0x0000,8).equals("12345678"));
+  EXPECT_TRUE(BufData.substr(0x0FF8,8).equals("12345678"));
+  EXPECT_TRUE(BufData.substr(0x1000,8).equals("abcdefgh"));
+  EXPECT_TRUE(BufData.substr(0x2FF8,8).equals("abcdefgh"));
+  EXPECT_TRUE(BufData.substr(0x3000,8).equals("ABCDEFGH"));
+  EXPECT_TRUE(BufData.substr(0x3FF8,8).equals("ABCDEFGH"));
+   
+  // Try non-page aligned.
+  ErrorOr<OwningBuffer> MB2 = MemoryBuffer::getFileSlice(TestPath.str(),
+                                                         0x3000, 0x0800);
+  EC = MB2.getError();
+  ASSERT_FALSE(EC);
+  EXPECT_EQ(0x3000UL, MB2.get()->getBufferSize());
+  
+  StringRef BufData2 = MB2.get()->getBuffer();
+  EXPECT_TRUE(BufData2.substr(0x0000,8).equals("12345678"));
+  EXPECT_TRUE(BufData2.substr(0x17F8,8).equals("12345678"));
+  EXPECT_TRUE(BufData2.substr(0x1800,8).equals("abcdefgh"));
+  EXPECT_TRUE(BufData2.substr(0x2FF8,8).equals("abcdefgh"));
+}
+}