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

[Pierre van Houtryve via llvm-commits]

Pierre-vh 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.


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