[clang] [flang] [flang][Driver] Support -print-supported-cpus and associated aliases (PR #117199)

[Andrzej Warzyński via cfe-commits]

banach-space wrote:

> Notes for reviewers: The corresponding test in clang/test/Driver/print-supported-cpus.c tests two different architectures in the same file. This has been split into two separate tests here to allow the test to be run in cases where only one of the targets has been built.

Wouldn't something like this work: https://github.com/llvm/llvm-project/blob/4086ead63c7e0b56b3b07873117bb7ad7a02d41c/flang/test/Driver/tune-cpu-fir.f90#L1-L3

?

https://github.com/llvm/llvm-project/pull/117199