[flang] [clang] [Flang][Clang] Add support for frame pointers in Flang Driver (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.

I see that you added [frame-pointer-codegen.f90](https://github.com/llvm/llvm-project/pull/72146/files#diff-76ca50365c8a0eb4797ce10b121021e7da52cc86523d806e1ade530a897de7e8), but that does not test how flags added in this patch impact code-gen. Please add a test that will demonstrate how this flag impacts the generated code.

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