[llvm] [InstCombine] Add cast support in simplifyUsingControlFlow (PR #142263)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

Hm, I'd consider enabling this only for switches to start with. Converting phi to zext for the br case is a lot more likely to cause regressions.

https://github.com/llvm/llvm-project/pull/142263