[clang] [Clang][CodeGen] Emit alignment information for indirect arguments (PR #201999)

[Nikita Popov via cfe-commits]

nikic wrote:

> This PR will fix the first half of this problem, which is emitting alignment information. Dereferenceability information will be added in a subsequent PR.

When you get around to that, it would be good to also add nofree and noalias at the same time, to make sure the dereferenceability information will remain valid after deref-at-point semantics are enabled.

https://github.com/llvm/llvm-project/pull/201999