Jakob Stoklund Olesen 6b88c180da Handle register masks in DeadMachineInstructionElim.
Don't track live physregs that are clobbered by a register mask operand.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148588 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-20 22:27:09 +00:00
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