[llvm] [LoopIdiomVectorize] Remove redundant DomTreeUpdates (PR #94681)

[Min-Yih Hsu via llvm-commits]

mshockwave wrote:

> In principle this seems to make sense, but looks like the patch needs a rebase?

Yes, it's rebased now.

https://github.com/llvm/llvm-project/pull/94681