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1. Change the software pipeliner to use unknown size instead of dropping memory operands. It used to do it before, but MachineInstr::mayAlias did not handle it correctly. 2. Recognize UnknownSize in MachineInstr::mayAlias. 3. Print and parse UnknownSize in MIR. Differential Revision: https://reviews.llvm.org/D50339 llvm-svn: 340208