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

[Thorsten Schütt via llvm-commits]

tschuett wrote:

Did you mean `the carry in to G_UADDO`?

For the G_**DDOs, there are combines relying on known bits, but the G**DDEs are really bad to combine.

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