[llvm] ValueTracking: simplify udiv/urem recurrences (PR #108973)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

This patch is a very minor improvement, but an improvement nevertheless. I don't see it regressing compile-time, so it should be good, no?

https://github.com/llvm/llvm-project/pull/108973