[clang] [flang] [Flang][Driver][Offload] Support -Xoffload-linker argument in Flang (PR #109907)

[Tom Eccles via cfe-commits]

tblah wrote:

The CI failures look relevant. The problem isn't immediately apparent to me from the diff (which looks good to me).

https://github.com/llvm/llvm-project/pull/109907