[llvm-branch-commits] [flang] release/20.x: [flang] fix AArch64 PCS for struct following pointer (#127802) (PR #128518)

[David Truby via llvm-branch-commits]

DavidTruby wrote:

For context, this fixes an ICE in the specific scenario where you are trying to call a C function from Fortran that has both pointer and struct arguments, on AArch64. It’s quite niche but does cause a hard crash with a completely useless error message.

I was hoping we could get it in to 20 just because the fix is very simple and since it only touches this specific scenario it's low risk too.

https://github.com/llvm/llvm-project/pull/128518