[llvm] [GlobalISel] Add iterative known-bits evaluation to GISelValueTracking (PR #221755)

[via llvm-commits]

daemonpilot wrote:

Hi @tgymnich, just following up on the compile-time results above: since the compile-time overhead with the current implementation is +0.01%, I was wondering if this looks acceptable, or if you'd still prefer me to refactor the logic?

Please let me know your thoughts when you have a moment. Thanks!

https://github.com/llvm/llvm-project/pull/221755