[clang] [Clang] Forward `-Xarch_<arch> -Wl,foo` for GPU toolchains (PR #126248)

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dyung wrote:

@jhuber6 I've seen 2 seemingly random failures of the offload-Xarch.c test on my mac buildbots lately. Any idea why this might be happening?

https://lab.llvm.org/buildbot/#/builders/190/builds/14302
https://lab.llvm.org/buildbot/#/builders/23/builds/7414

The test generally seems to pass, but two of the bots hit the same failure in this test.

https://github.com/llvm/llvm-project/pull/126248