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

[Pete Steinfeld via flang-commits]

https://github.com/psteinfeld requested changes to this pull request.

I didn't understand most of it, but what I understood looks good.

I found one nit and one compilation error that needs to be fixed.

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