[clang] [AMDGPU] Allow overload of __builtin_amdgcn_mov/update_dpp (PR #112447)

[Yaxun Liu via cfe-commits]

yxsamliu wrote:

> This needs some sema type restrictions to make sure it's something sensible

+1 also need sema lit test

https://github.com/llvm/llvm-project/pull/112447