[llvm] [clang] [AMDGPU] Adding the amdgpu-num-work-groups function attribute (PR #79035)

[Jun Wang via cfe-commits]

jwanggit86 wrote:

I thought about having one attribute with 6 numbers. Then you have to provide 6 numbers when using it. In the current design, either the min or the max attribute can be omitted.

https://github.com/llvm/llvm-project/pull/79035