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Jakob Stoklund Olesen c52390cafe Create a struct representing register units in TableGen.
Besides the weight, we also want to store up to two root registers per
unit. Most units will have a single root, the leaf register they
represent. Units created for ad hoc aliasing get two roots: The two
aliasing registers.

The root registers can be used to compute the set of overlapping
registers.

llvm-svn: 156792
2012-05-15 00:50:23 +00:00
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