[OpenMP] Make `-Xarch_host` and `-Xarch_device` work for OpenMP offloading

Clang currently supports the `-Xarch_host` and `-Xarch_device` variants
to handle passing arguments to only one part of the offloading
toolchain. This was previously only supported fully for HIP / CUDA This
patch simple updates the logic to make it work for any offloading kind.

Fixes #59799

Reviewed By: tianshilei1992

Differential Revision: https://reviews.llvm.org/D141935