[llvm] [SelectionDAG] Optimize 32-bit udiv with 33-bit magic constants on 64-bit targets (PR #181288)

[MITSUNARI Shigeo via llvm-commits]

herumi wrote:

>Do you need to me to merge this?

Yes, please. Is there anything you’d like me to do first, such as squashing the commits into a single commit?

https://github.com/llvm/llvm-project/pull/181288