[clang] [llvm] AMDGPU: Add builtin/intrinsic global_(load|store)_b128 (PR #172090)

[Shilei Tian via llvm-commits]

https://github.com/shiltian requested changes to this pull request.

I think using a string for a user-facing interface is a bad design. The Sema check also doesn't check whether the scope string is valid or not. This should be something like a memory order value for those GCC atomic builtins.

https://github.com/llvm/llvm-project/pull/172090