- **[ValueTracking] Add test for issue 124275**
- **[ValueTracking] Fix bug of using wrong condition for deducing
KnownBits**
Fixes https://github.com/llvm/llvm-project/issues/124275
Bug was introduced by https://github.com/llvm/llvm-project/pull/114689
Now that computeKnownBits supports breaking out of recursive Phi
nodes, `IncValue` can be an operand of a different Phi than `P`. This
breaks the previous assumptions we had when using the possibly
condition at `CxtI` to constrain `IncValue`.
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