[clang] [libc] [llvm] Reapply "[AMDGPU] Use COV6 by default (#118515)" (PR #130963)

[Joseph Huber via llvm-commits]

================
@@ -332,6 +332,8 @@ Target Specific Changes
 AMDGPU Support
 ^^^^^^^^^^^^^^
 
+- Bump the default code object version to 6. ROCm 6.3 is required to run any program compiled with COV6.
----------------
jhuber6 wrote:

Yes, I have no clue why we don't provide that in the HSA header. Probably some ill-conceived notion that HSA is independent to ROCm.

https://github.com/llvm/llvm-project/pull/130963