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

[Vedant Tewari via llvm-commits]

xevor11 wrote:

Just pushed header files for ranges shift left and shift right for review, I was wondering if the directives and the argument types are correct, a specific format to follow?

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