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

[via llvm-commits]

philnik777 wrote:

> @philnik777 Last we spoke, the design work around the customization points was still ongoing. Have we locked it in now?

Kind-of, but not really. We'll probably get more insights while working on this. We're working closely with @AntonRydahl and others to get this backend into libc++.

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