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[SCEVExpander] Make findExistingExpansion smarter
Summary: Extending findExistingExpansion can use existing value in ExprValueMap. This patch gives 0.3~0.5% performance improvements on benchmarks(test-suite, spec2000, spec2006, commercial benchmark) Reviewers: mzolotukhin, sanjoy, zzheng Differential Revision: http://reviews.llvm.org/D15559 llvm-svn: 260938
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