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

[Stanislav Mekhanoshin via cfe-commits]

rampitec wrote:

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

Added.

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