[flang-commits] [flang] [flang] Add struct passing target rewrite hooks and partial X86-64 impl (PR #74829)

[Slava Zakharin via flang-commits]

https://github.com/vzakhari approved this pull request.

Thank you for the update, Jean!  I have only one minor comment about `0` alignment.

https://github.com/llvm/llvm-project/pull/74829