[AMDGPU] Remove Code Object V2 (#65715)

Code Object V2 has been deprecated for more than a year now. We can
safely remove it from LLVM.

- [clang] Remove support for the `-mcode-object-version=2` option.
- [lld] Remove/refactor tests that were still using COV2
- [llvm] Update AMDGPUUsage.rst
- Code Object V2 docs are left for informational purposes because those
code objects may still be supported by the runtime/loaders for a while.
- [AMDGPU] Remove COV2 emission capabilities.
- [AMDGPU] Remove `MetadataStreamerYamlV2` which was only used by COV2
- [AMDGPU] Update all tests that were still using COV2 - They are either
deleted or ported directly to code object v4 (as v3 is also planned to
be removed soon).

1 files changed, 2 insertions, 7 deletions

diff --git a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h
index 5b0a72b..f9e4e82 100644
--- a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h
+++ b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h
@@ -43,17 +43,15 @@ namespace AMDGPU {
 struct IsaVersion;
 
 enum {
-  AMDHSA_COV2 = 2,
   AMDHSA_COV3 = 3,
   AMDHSA_COV4 = 4,
   AMDHSA_COV5 = 5
 };
 
+/// \returns True if \p STI is AMDHSA.
+bool isHsaAbi(const MCSubtargetInfo &STI);
 /// \returns HSA OS ABI Version identification.
 std::optional<uint8_t> getHsaAbiVersion(const MCSubtargetInfo *STI);
-/// \returns True if HSA OS ABI Version identification is 2,
-/// false otherwise.
-bool isHsaAbiVersion2(const MCSubtargetInfo *STI);
 /// \returns True if HSA OS ABI Version identification is 3,
 /// false otherwise.
 bool isHsaAbiVersion3(const MCSubtargetInfo *STI);
@@ -63,9 +61,6 @@ bool isHsaAbiVersion4(const MCSubtargetInfo *STI);
 /// \returns True if HSA OS ABI Version identification is 5,
 /// false otherwise.
 bool isHsaAbiVersion5(const MCSubtargetInfo *STI);
-/// \returns True if HSA OS ABI Version identification is 3 and above,
-/// false otherwise.
-bool isHsaAbiVersion3AndAbove(const MCSubtargetInfo *STI);
 
 /// \returns The offset of the multigrid_sync_arg argument from implicitarg_ptr
 unsigned getMultigridSyncArgImplicitArgPosition(unsigned COV);