[clang] [flang] [Flang][Driver] Add -print-resource-dir command line flag to emit Flang's resource directory (PR #90886)

[Andrzej Warzyński via cfe-commits]

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+! RUN: %flang -print-resource-dir -resource-dir=%S/Inputs/resource_dir \
+! RUN:  | FileCheck -check-prefix=PRINT-RESOURCE-DIR -DFILE=%S/Inputs/resource_dir %s
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banach-space wrote:

> So, my feeling is that this refactoring should take place in a different PR.

Makes sense.

https://github.com/llvm/llvm-project/pull/90886