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

[Mirko Brkušanin via llvm-commits]

mbrkusanin wrote:

> 
>     * TH_LU/TH_WB are both available <SCOPE_SYS
> 
>     * TH_BYPASS is a thing, but only available for SCOPE_SYS
> 

This is how it was described in older versions of docs and how SP3 is still currently displaying th=3. Current version does not mention TH_LOAD_BYPASS or TH_STORE_BYPASS. 

Either SP3 or the docs should be changed because now we have a mismatch. I do not know which one.

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