Andrew Trick dd9a50196c Introduce Register Units: Give each leaf register a number.
First small step toward modeling multi-register multi-pressure. In the
future, register units can also be used to model liveness and
aliasing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153794 91177308-0d34-0410-b5e6-96231b3b80d8
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