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f5d4e5158f
Each register unit has one or two root registers. The full set of registers containing a given register unit can be computed as the union of the root registers and their super-registers. Provide an MCRegUnitRootIterator class to enumerate the roots. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157753 91177308-0d34-0410-b5e6-96231b3b80d8