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Summary: First step in adding MemorySSA as dependency for loop pass manager. Adding the dependency under a flag. New pass manager: MSSA pointer in LoopStandardAnalysisResults can be null. Legacy and new pass manager: Use cl::opt EnableMSSALoopDependency. Disabled by default. Reviewers: sanjoy, davide, gberry Subscribers: mehdi_amini, Prazek, llvm-commits Differential Revision: https://reviews.llvm.org/D40274 llvm-svn: 318772