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[SystemZ] Improve foldMemoryOperandImpl().
Swap the compare operands if LHS is spilled while updating the CCMask:s of the CC users. This is relatively straight forward since the live-in lists for the CC register can be assumed to be correct during register allocation (thanks to 659efa2). Also fold a spilled operand of an LOCR/SELR into an LOC(G). Review: Ulrich Weigand Differential Revision: https://reviews.llvm.org/D67437
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