Revert "[Support] Add llvm::compression::{getReasonIfUnsupported,compress,decompress}"

This reverts commit 19dc3cff0f771bb8933136ef68e782553e920d04.
This reverts commit 5b19a1f8e88da9ec92b995bfee90043795c2c252.
This reverts commit 9397648ac8ad192f7e6e6a8e6894c27bf7e024e9.
This reverts commit 10842b44759f987777b08e7714ef77da2526473a.

Breaks the GCC build, as reported here:
https://reviews.llvm.org/D130506#3776415

1 files changed, 0 insertions, 44 deletions

diff --git a/llvm/lib/Support/Compression.cpp b/llvm/lib/Support/Compression.cpp
index 2e0a2c5..e8fb715 100644
--- a/llvm/lib/Support/Compression.cpp
+++ b/llvm/lib/Support/Compression.cpp
@@ -27,50 +27,6 @@
 using namespace llvm;
 using namespace llvm::compression;
 
-const char *compression::getReasonIfUnsupported(compression::Format F) {
-  switch (F) {
-  case compression::Format::Zlib:
-    if (zlib::isAvailable())
-      return nullptr;
-    return "LLVM was not built with LLVM_ENABLE_ZLIB or did not find zlib at "
-           "build time";
-  case compression::Format::Zstd:
-    if (zstd::isAvailable())
-      return nullptr;
-    return "LLVM was not built with LLVM_ENABLE_ZSTD or did not find zstd at "
-           "build time";
-  }
-}
-
-void compression::compress(Params P, ArrayRef<uint8_t> Input,
-                           SmallVectorImpl<uint8_t> &Output) {
-  switch (P.Format) {
-  case compression::Format::Zlib:
-    zlib::compress(Input, Output, P.Level);
-    break;
-  case compression::Format::Zstd:
-    zstd::compress(Input, Output, P.Level);
-    break;
-  }
-}
-
-Error compression::decompress(compression::Format F, ArrayRef<uint8_t> Input,
-                              SmallVectorImpl<uint8_t> &Output,
-                              size_t UncompressedSize) {
-  switch (F) {
-  case compression::Format::Zlib:
-    return zlib::uncompress(Input, Output, UncompressedSize);
-  case compression::Format::Zstd:
-    return zstd::uncompress(Input, Output, UncompressedSize);
-  }
-}
-
-Error compression::decompress(DebugCompressionType T, ArrayRef<uint8_t> Input,
-                              SmallVectorImpl<uint8_t> &Output,
-                              size_t UncompressedSize) {
-  return decompress(formatFor(T), Input, Output, UncompressedSize);
-}
-
 #if LLVM_ENABLE_ZLIB
 
 static StringRef convertZlibCodeToString(int Code) {