[llvm] [Inliner] Improve attribute propagation to callsites when inlining. (PR #66036)

[Johannes Doerfert via llvm-commits]

jdoerfert wrote:

I don't think 10 commit PRs are helpful. This should be 3 PRs at least. One is trivial, one is probably easy, and then one with the new stuff.

https://github.com/llvm/llvm-project/pull/66036