[libcxx] [libcxxabi] [llvm] Adding Separate OpenMP Offloading Backend to `libcxx/include/__algorithm/pstl_backends` (PR #66968)

[Vedant Paranjape via llvm-commits]

VedantParanjape wrote:

Thanks for the patch! I wanted to contribute to dev of openMP offload of std algoriths. Is this patch LGTM? and is it safe to base my work on top of this?

https://github.com/llvm/llvm-project/pull/66968