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PR16069 is an interesting case where an incoming value to a PHI is a trap value while also being a 'ConstantExpr'. We do not consider this case when performing the 'HoistThenElseCodeToIf' optimization. Instead, make our modifications more conservative if we detect that we cannot transform the PHI to a select. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183152 91177308-0d34-0410-b5e6-96231b3b80d8