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ed297abb0a
m_ZExt might bind against a ConstantExpr instead of an Instruction. Assuming this, using cast<Instruction>, results in InstCombine crashing. Instead, introduce ZExtOperator to bridge both Instruction and ConstantExpr ZExts. This fixes PR21445. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221069 91177308-0d34-0410-b5e6-96231b3b80d8
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