Matthias Braun da74817c50 Introduce ad hoc liveness tracking utility: LiveRegUnits
Contains a set of live register (units) and code to move forward and
backward in the schedule while updating the live set.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192481 91177308-0d34-0410-b5e6-96231b3b80d8
2013-10-11 19:04:35 +00:00
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