expandAddToGEP - Expand an addition expression with a pointer type into a GEP instead of using ptrtoint+arithmetic+inttoptr. This helps BasicAliasAnalysis and other passes analyze the result. See the rules for getelementptr vs. inttoptr in http://llvm.org/docs/LangRef.html#pointeraliasing for details. Design note: The correctness of using getelementptr here depends on ScalarEvolution not recogniz
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