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Refactor LiveIntervals::renameDisconnectedComponents() to be a pass. Also change the name to "RenameIndependentSubregs": - renameDisconnectedComponents() worked on a MachineFunction at a time so it is a natural candidate for a machine function pass. - The algorithm is testable with a .mir test now. - This also fixes a problem where the lazy renaming as part of the MachineScheduler introduced IMPLICIT_DEF instructions after the number of a nodes in a region were counted leading to a mismatch. Differential Revision: http://reviews.llvm.org/D20507 llvm-svn: 271345
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