[llvm] [NFC][AMDGPU] Introduce SIInstrFlags predicates for TSFlag access (PR #201512)

[Piotr Sobczak via llvm-commits]

piotrAMD wrote:

The variadic template looks a bit unusual, but I can see the motivation to make call sites look cleaner.
I added one nit inline. Otherwise, this looks good to me.

https://github.com/llvm/llvm-project/pull/201512