[clang] [flang] [flang][driver] Make -stdlib= option visible to flang and silently ignored by it (PR #110598)

[Paul Osmialowski via cfe-commits]

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+// REQUIRES: system-linux
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pawosm-arm wrote:

As I stated in my other comment, the `-###` output is not affected by the `-stdlib=` flag, so a test which looks at its output would not provide a great value. The integration test from the other hand guards that the real-life scenario that I've encountered could be resolved with `flang-new`.


https://github.com/llvm/llvm-project/pull/110598