[llvm] [AMDGPU] Allow WorkgroupID intrinsics in amdgpu_gfx functions (PR #89773)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm approved this pull request.

We probably want a different version of isCompute that covers AMDGPU_Gfx, if not just include it there 

https://github.com/llvm/llvm-project/pull/89773