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Several visitors check if operands to the instruction are constants, either as it is or after looking up SimplifiedValues, check if the result is a constant and update the SimplifiedValues map. This refactoring splits it into a common function that does the checking of whether the operands are constants and updating of the SimplifiedValues table, and an instruction specific part that is implemented by each instruction visitor as a lambda and passed to the common function. Differential revision: https://reviews.llvm.org/D30104 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@295552 91177308-0d34-0410-b5e6-96231b3b80d8
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