[clang] [flang] [Flang][Clang] Add support for frame pointers in Flang (PR #72146)

[Andrzej Warzyński via cfe-commits]

banach-space wrote:

Could you add some tests? In e.g. "driver-help.f90" we merely test that a flag is visible.

https://github.com/llvm/llvm-project/pull/72146