Index: llvm/include/llvm/Support/raw_sha1_ostream.h
===================================================================
--- llvm/include/llvm/Support/raw_sha1_ostream.h
+++ /dev/null
@@ -1,46 +0,0 @@
-//==- raw_sha1_ostream.h - raw_ostream that compute SHA1        --*- C++ -*-==//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-//  This file defines the raw_sha1_ostream class.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_SUPPORT_RAW_SHA1_OSTREAM_H
-#define LLVM_SUPPORT_RAW_SHA1_OSTREAM_H
-
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/Support/SHA1.h"
-#include "llvm/Support/raw_ostream.h"
-
-namespace llvm {
-
-/// A raw_ostream that hash the content using the sha1 algorithm.
-class raw_sha1_ostream : public raw_ostream {
-  SHA1 State;
-
-  /// See raw_ostream::write_impl.
-  void write_impl(const char *Ptr, size_t Size) override {
-    State.update(ArrayRef<uint8_t>((const uint8_t *)Ptr, Size));
-  }
-
-public:
-  /// Return the current SHA1 hash for the content of the stream
-  StringRef sha1() {
-    flush();
-    return State.result();
-  }
-
-  /// Reset the internal state to start over from scratch.
-  void resetHash() { State.init(); }
-
-  uint64_t current_pos() const override { return 0; }
-};
-
-} // end llvm namespace
-
-#endif
Index: llvm/unittests/Support/CMakeLists.txt
===================================================================
--- llvm/unittests/Support/CMakeLists.txt
+++ llvm/unittests/Support/CMakeLists.txt
@@ -90,7 +90,6 @@
   formatted_raw_ostream_test.cpp
   raw_ostream_test.cpp
   raw_pwrite_stream_test.cpp
-  raw_sha1_ostream_test.cpp
   xxhashTest.cpp
   )
 
Index: llvm/unittests/Support/raw_sha1_ostream_test.cpp
===================================================================
--- llvm/unittests/Support/raw_sha1_ostream_test.cpp
+++ /dev/null
@@ -1,93 +0,0 @@
-//===- llvm/unittest/Support/raw_ostream_test.cpp - raw_ostream tests -----===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Support/Format.h"
-#include "llvm/Support/raw_sha1_ostream.h"
-#include "gtest/gtest.h"
-
-#include <string>
-
-using namespace llvm;
-
-static std::string toHex(StringRef Input) {
-  static const char *const LUT = "0123456789ABCDEF";
-  size_t Length = Input.size();
-
-  std::string Output;
-  Output.reserve(2 * Length);
-  for (size_t i = 0; i < Length; ++i) {
-    const unsigned char c = Input[i];
-    Output.push_back(LUT[c >> 4]);
-    Output.push_back(LUT[c & 15]);
-  }
-  return Output;
-}
-
-TEST(raw_sha1_ostreamTest, Basic) {
-  llvm::raw_sha1_ostream Sha1Stream;
-  Sha1Stream << "Hello World!";
-  auto Hash = toHex(Sha1Stream.sha1());
-
-  ASSERT_EQ("2EF7BDE608CE5404E97D5F042F95F89F1C232871", Hash);
-}
-
-TEST(sha1_hash_test, Basic) {
-  ArrayRef<uint8_t> Input((const uint8_t *)"Hello World!", 12);
-  std::array<uint8_t, 20> Vec = SHA1::hash(Input);
-  std::string Hash = toHex({(const char *)Vec.data(), 20});
-  ASSERT_EQ("2EF7BDE608CE5404E97D5F042F95F89F1C232871", Hash);
-}
-
-TEST(sha1_hash_test, Update) {
-  SHA1 sha1;
-  std::string Input = "123456789012345678901234567890";
-  ASSERT_EQ(Input.size(), 30UL);
-  // 3 short updates.
-  sha1.update(Input);
-  sha1.update(Input);
-  sha1.update(Input);
-  // Long update that gets into the optimized loop with prefix/suffix.
-  sha1.update(Input + Input + Input + Input);
-  // 18 bytes buffered now.
-
-  std::string Hash = toHex(sha1.final());
-  ASSERT_EQ("3E4A614101AD84985AB0FE54DC12A6D71551E5AE", Hash);
-}
-
-// Check that getting the intermediate hash in the middle of the stream does
-// not invalidate the final result.
-TEST(raw_sha1_ostreamTest, Intermediate) {
-  llvm::raw_sha1_ostream Sha1Stream;
-  Sha1Stream << "Hello";
-  auto Hash = toHex(Sha1Stream.sha1());
-
-  ASSERT_EQ("F7FF9E8B7BB2E09B70935A5D785E0CC5D9D0ABF0", Hash);
-  Sha1Stream << " World!";
-  Hash = toHex(Sha1Stream.sha1());
-
-  // Compute the non-split hash separately as a reference.
-  llvm::raw_sha1_ostream NonSplitSha1Stream;
-  NonSplitSha1Stream << "Hello World!";
-  auto NonSplitHash = toHex(NonSplitSha1Stream.sha1());
-
-  ASSERT_EQ(NonSplitHash, Hash);
-}
-
-TEST(raw_sha1_ostreamTest, Reset) {
-  llvm::raw_sha1_ostream Sha1Stream;
-  Sha1Stream << "Hello";
-  auto Hash = toHex(Sha1Stream.sha1());
-
-  ASSERT_EQ("F7FF9E8B7BB2E09B70935A5D785E0CC5D9D0ABF0", Hash);
-
-  Sha1Stream.resetHash();
-  Sha1Stream << " World!";
-  Hash = toHex(Sha1Stream.sha1());
-
-  ASSERT_EQ("7447F2A5A42185C8CF91E632789C431830B59067", Hash);
-}
Index: llvm/utils/gn/secondary/llvm/unittests/Support/BUILD.gn
===================================================================
--- llvm/utils/gn/secondary/llvm/unittests/Support/BUILD.gn
+++ llvm/utils/gn/secondary/llvm/unittests/Support/BUILD.gn
@@ -93,7 +93,6 @@
     "formatted_raw_ostream_test.cpp",
     "raw_ostream_test.cpp",
     "raw_pwrite_stream_test.cpp",
-    "raw_sha1_ostream_test.cpp",
     "xxhashTest.cpp",
   ]
 }