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

[Krzysztof Drewniak via llvm-commits]

krzysz00 wrote:

Oh, yeah, agreed that known-bits data is marginal ... but a big pile of marginal improvements stacks up.

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