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Marking implicit CC defs as dead everywhere except when CC is actually defined and used explicitly, is important since the post-ra scheduler will otherwise insert edges between instructions unnecessarily. Also temporarily disable LA(Y)-> AGSI optimization in foldMemoryOperandImpl(), since this inroduces a def of the CC reg, which is illegal unless it is known to be dead. Reviewed by Ulrich Weigand. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268215 91177308-0d34-0410-b5e6-96231b3b80d8
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