[llvm] Unify max alignment for arguments with generic max align. (PR #99257)

[Phoebe Wang via llvm-commits]

phoebewang wrote:

> Thank you! That helps with the problem I was originally trying to solve with #98629 . Does it make sense to keep #98629 but with the increased limit?

Given #98629 has side effect on Darwin targets, I'd like to not pursuit it if the original problem getting solve.

https://github.com/llvm/llvm-project/pull/99257