Jonas Paulsson 9028acf0b3 [SystemZ] Mark CC defs as dead whenever possible. ...

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.

llvm-svn: 268215

2016-05-02 09:37:40 +00:00

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