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

[Yingwei Zheng via llvm-commits]

dtcxzyw 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.

Feel free to submit task here: https://github.com/dtcxzyw/llvm-opt-benchmark/issues/1312

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