[clang] [Clang][AMDGPU] Add a builtin for llvm.amdgcn.make.buffer.rsrc intrinsic (PR #95276)

[Matt Arsenault via cfe-commits]

arsenm wrote:

> I understand the chance of conflict is low. It may be like the chance of hitting by a meteor. However, if we prefix with `__amdgcn_`, there is no such risk. And we have the benefit to clearly indicate it is a amdgcn target-specific type.

Should use amdgpu 

https://github.com/llvm/llvm-project/pull/95276