[llvm] [ArgPromotion] Handle pointer arguments of recursive calls (PR #78735)

[Eli Friedman via llvm-commits]

https://github.com/efriedma-quic approved this pull request.

LGTM with one minor comment.

(In the future, please give a little more time for people to reply; I get a lot of review email every day.)

https://github.com/llvm/llvm-project/pull/78735