[llvm] [AMDGPU] Remove TH_BYPASS from CPol (PR #139887)

[Jay Foad via llvm-commits]

jayfoad wrote:

> > What's the rationale?
> 
> `TH_BYPASS` is not the canonical way to print this temporal hint bit (see 4.1.1. in https://www.amd.com/content/dam/amd/en/documents/radeon-tech-docs/instruction-set-architectures/rdna4-instruction-set-architecture.pdf ); We use LU/WB.

Sadly I don't think the public ISA doc is too useful as a reference for assembler syntax. We generally try to follow SP3 instead, unless there is a good reason to diverge from it.

https://github.com/llvm/llvm-project/pull/139887