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

[Andrzej Warzyński via cfe-commits]

https://github.com/banach-space commented:

What's the definition of "resource dir" for Fortran?

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