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

[MITSUNARI Shigeo via llvm-commits]

herumi wrote:

Thanks. Done -- split into two commits (still one PR):
the first adds the tests with the existing codegen, the second makes the change and updates the test output.


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