Revert "[llvm] add zstd to llvm::compression namespace"

This reverts commit d449c600767284486615f3b79601ced15a00af61.

Breaks macOS builds with this:
llvm/lib/Support/Compression.cpp:24:10: fatal error: 'zstd.h' file not found

1 files changed, 0 insertions, 65 deletions

diff --git a/llvm/lib/Support/Compression.cpp b/llvm/lib/Support/Compression.cpp
index e8fb715..2119197 100644
--- a/llvm/lib/Support/Compression.cpp
+++ b/llvm/lib/Support/Compression.cpp
@@ -20,9 +20,6 @@
 #if LLVM_ENABLE_ZLIB
 #include <zlib.h>
 #endif
-#if LLVM_ENABLE_ZSTD
-#include <zstd.h>
-#endif
 
 using namespace llvm;
 using namespace llvm::compression;
@@ -103,65 +100,3 @@ Error zlib::uncompress(ArrayRef<uint8_t> Input,
   llvm_unreachable("zlib::uncompress is unavailable");
 }
 #endif
-
-#if LLVM_ENABLE_ZSTD
-
-bool zstd::isAvailable() { return true; }
-
-void zstd::compress(ArrayRef<uint8_t> Input,
-                    SmallVectorImpl<uint8_t> &CompressedBuffer, int Level) {
-  unsigned long CompressedBufferSize = ::ZSTD_compressBound(Input.size());
-  CompressedBuffer.resize_for_overwrite(CompressedBufferSize);
-  unsigned long CompressedSize =
-      ::ZSTD_compress((char *)CompressedBuffer.data(), CompressedBufferSize,
-                      (const char *)Input.data(), Input.size(), Level);
-  if (ZSTD_isError(CompressedSize))
-    report_bad_alloc_error("Allocation failed");
-  // Tell MemorySanitizer that zstd output buffer is fully initialized.
-  // This avoids a false report when running LLVM with uninstrumented ZLib.
-  __msan_unpoison(CompressedBuffer.data(), CompressedSize);
-  if (CompressedSize < CompressedBuffer.size())
-    CompressedBuffer.truncate(CompressedSize);
-}
-
-Error zstd::uncompress(ArrayRef<uint8_t> Input, uint8_t *UncompressedBuffer,
-                       size_t &UncompressedSize) {
-  const size_t Res =
-      ::ZSTD_decompress(UncompressedBuffer, UncompressedSize,
-                        (const uint8_t *)Input.data(), Input.size());
-  UncompressedSize = Res;
-  // Tell MemorySanitizer that zstd output buffer is fully initialized.
-  // This avoids a false report when running LLVM with uninstrumented ZLib.
-  __msan_unpoison(UncompressedBuffer, UncompressedSize);
-  return ZSTD_isError(Res) ? make_error<StringError>(ZSTD_getErrorName(Res),
-                                                     inconvertibleErrorCode())
-                           : Error::success();
-}
-
-Error zstd::uncompress(ArrayRef<uint8_t> Input,
-                       SmallVectorImpl<uint8_t> &UncompressedBuffer,
-                       size_t UncompressedSize) {
-  UncompressedBuffer.resize_for_overwrite(UncompressedSize);
-  Error E =
-      zstd::uncompress(Input, UncompressedBuffer.data(), UncompressedSize);
-  if (UncompressedSize < UncompressedBuffer.size())
-    UncompressedBuffer.truncate(UncompressedSize);
-  return E;
-}
-
-#else
-bool zstd::isAvailable() { return false; }
-void zstd::compress(ArrayRef<uint8_t> Input,
-                    SmallVectorImpl<uint8_t> &CompressedBuffer, int Level) {
-  llvm_unreachable("zstd::compress is unavailable");
-}
-Error zstd::uncompress(ArrayRef<uint8_t> Input, uint8_t *UncompressedBuffer,
-                       size_t &UncompressedSize) {
-  llvm_unreachable("zstd::uncompress is unavailable");
-}
-Error zstd::uncompress(ArrayRef<uint8_t> Input,
-                       SmallVectorImpl<uint8_t> &UncompressedBuffer,
-                       size_t UncompressedSize) {
-  llvm_unreachable("zstd::uncompress is unavailable");
-}
-#endif