[clang] [compiler-rt] [llvm] [X86] Hygon Processors Initial enablement (PR #187622)

[Simon Pilgrim via cfe-commits]

https://github.com/RKSimon requested changes to this pull request.

Relevant CI failures?
```
Failed Tests (4):
  LLVM :: tools/llvm-mca/X86/4GM4/zero-idioms.s
  LLVM :: tools/llvm-mca/X86/4GM7/independent-load-stores.s
  LLVM :: tools/llvm-mca/X86/4GM7/partially-overlapping-group-resources.s
  LLVM :: tools/llvm-mca/X86/4GM7/zero-idioms.s
```
Also, please can you update those folder names not to have a leading numeric (C864GM* instead?)

https://github.com/llvm/llvm-project/pull/187622