Matthias Braun 01ddf04b63 LiveInterval: Add support to track liveness of subregisters.
This code adds the required data structures. Algorithms to compute it follow.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223877 91177308-0d34-0410-b5e6-96231b3b80d8
2014-12-10 01:12:10 +00:00
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