[clang] [flang] [llvm] [flang] Add -finit-local= to initialize automatic variables (PR #216164)

[via llvm-commits]

https://github.com/MattPD commented:

Verified against `185367705b6201097ed1f2e4f4a12ee651530088`. The three fixes from the last round hold up. I have left a few inline questions.

https://github.com/llvm/llvm-project/pull/216164