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

[Johannes Doerfert via llvm-commits]

jdoerfert wrote:

> It crashes at runtime due to a missing symbol, but it compiles fine.

For now, use -fno-exceptions for the compilation, otherwise the host and device symbols are out of whack. That will be resolved in the future but is required now and needs to be documented.

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