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

[David Truby via cfe-commits]

DavidTruby wrote:

Hi @mjklemm, this appears to be breaking linking entirely on Windows, I'm not sure how it's taken us so long to notice...
With the patch I get errors trying to find compiler-rt but without it I can build fine. I wonder why this patch _changed_ the resource directory, as well as making it printable with a flag?

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