[llvm] [SelectionDAG] Widen even 33-bit-magic udiv on free-zext targets (PR #207634)

[Craig Topper via llvm-commits]

topperc wrote:

Please split this PR to have 2 commits (still 1 PR). One commit that adds the tests with existing codegen, and one commit that makes the change and shows the changed test output.

https://github.com/llvm/llvm-project/pull/207634