[InstCombine] Don't simplify `icmp eq/ne OneUse(A ^ Cst1), Cst2` in foldICmpEquality

This special case will be handled in foldICmpXorConstant later.
See also commit e9cb50a1e351e90be1a8e4ac1a4564cfc44a984b.

GitOrigin-RevId: c4e2fcff788025415b523486efdbdac4f2b08c1e
2 files changed