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Summary: The LoadStoreOptimizer was creating instructions with 2 MachineMemOperands, which meant they were assumed to alias with all other instructions, because MachineInstr:mayAlias() returns true when an instruction has multiple MachineMemOperands. This was preventing these instructions from being merged again, and was giving the scheduler less freedom to reorder them. Reviewers: arsenm, nhaehnle Reviewed By: arsenm Subscribers: kzhuravl, jvesely, wdng, yaxunl, dstuttard, tpr, t-tye, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D65036 llvm-svn: 367237