[llvm] GlobalISel: Use G_UADDE when narrowing G_UMULH (PR #97194)

[Thorsten Schütt via llvm-commits]

tschuett wrote:

https://github.com/llvm/llvm-project/issues/92309

abstraction raising:  combine primitive ops into a higher abstraction:
https://github.com/llvm/llvm-project/blob/66d86a63e7f10905fd3e6104cebceeb53851ff1d/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp#L4523

The same would be combining from more primitives ops into G_UADDE.

https://github.com/llvm/llvm-project/pull/97194