[llvm] [Offload] Add olLaunchKernelSuggestedGroupSize (PR #142130)

[Joseph Huber via llvm-commits]

jhuber6 wrote:

Yes, I am planning on pulling a lot of these OpenMP specific globals into `libomptarget`. Just haven't gotten around to it.

https://github.com/llvm/llvm-project/pull/142130