[clang] [flang] [flang][Driver] Support -print-supported-extensions (PR #117402)

[Andrzej Warzyński via cfe-commits]

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+! Test that --print-supported-extensions errors on unsupported architectures.
+
+! REQUIRES: x86-registered-target
+
+! RUN: not %flang --target=x86_64-linux-gnu --print-supported-extensions \
+! RUN:   2>&1 | FileCheck %s
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banach-space wrote:

As in, this option is not available for X86 _at all_?

https://github.com/llvm/llvm-project/pull/117402