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This is the third attemp to recommit r292526. The original summary: Currently, a GEP is considered free only if its indices are all constant. TTI::getGEPCost() can give target-specific more accurate analysis. TTI is already used for the cost of many other instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292633 91177308-0d34-0410-b5e6-96231b3b80d8