[llvm] [AMDGPU] Add function attribute to disable TBUFFER combine (PR #156454)

[Harrison Hao via llvm-commits]

harrisonGPU wrote:

> This is not a robust feature design, it is hacking out a singular transformation. You need to define a semantic meaning, have the default be conservatively correct

Hi, Matt, I don't know how to define a semantic meaning, could you please give me some suggestions? 

https://github.com/llvm/llvm-project/pull/156454