Jakob Stoklund Olesen bb1e98318f Convert COPY instructions into KILLs if they have implicit defs. ...

MachineCopyPropagation doesn't understand super-register liveness well
enough to be able to remove implicit defs of super-registers.

This fixes a problem in ARM/2012-01-26-CopyPropKills.ll that is exposed
by an future TwoAddressInstructionPass change. The KILL instructions are
removed before the machine code is emitted.

llvm-svn: 169060

2012-11-30 23:53:00 +00:00

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