[llvm] [InstCombine] Simplify phi using KnownBits of condition (PR #134712)

[Andreas Jonson via llvm-commits]

andjo403 wrote:

@dtcxzyw can you re-tigger the benchmarks again, 
think that the compile time shall be better as only values in the DomConditionCache will be simplified and
 will also not simplify as mush now when the miscompilation is solved. 

https://github.com/llvm/llvm-project/pull/134712