[clang] [flang] [flang][Driver] Add support for -f[no]keep-inline-functions option (PR #230007)

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https://github.com/kwyatt-ext approved this pull request.

LGTM, once the question from Tauren is resolved.  I don't know enough to speak to it and I think Eugene pinged more knowledgeable individuals.

https://github.com/llvm/llvm-project/pull/230007