[clang] Sync with missing builtins from amd-staging (PR #223519)

[Matt Arsenault via cfe-commits]

https://github.com/arsenm commented:

We shouldn't add these. These were the old names before __builtin_amdgcn_av_load_b128 / __builtin_amdgcn_av_store_b128

https://github.com/llvm/llvm-project/pull/223519