[clang] [Clang][AMDGPU] Add builtins for instrinsic `llvm.amdgcn.raw.buffer.store` (PR #94576)

[Matt Arsenault via cfe-commits]

https://github.com/arsenm commented:

I'm wondering if we should really have all the different typed variants, and if this should be the name. I guess

https://github.com/llvm/llvm-project/pull/94576