SimplifyCFG: Do not transform PHI to select if doing so would be unsafe
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. llvm-svn: 183152
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