[llvm] [MachineCSE] Expose dependent expressions during PRE (PR #226890)

[via llvm-commits]

Jinlock9 wrote:

> Please reply to this message to confirm that you have read these policies, especially the LLVM AI Tool Use Policy, and that any AI tool usage has been noted in the PR description.

I’ve read the linked policies, including the LLVM AI Tool Use Policy. Codex assistance is disclosed in the PR description.

https://github.com/llvm/llvm-project/pull/226890