RenameIndependentSubregs: Fix handling of undef tied operands
Ensure that, if updating a tied operand pair, to only update that pair. Differential Revision: https://reviews.llvm.org/D49052 llvm-svn: 336593
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Ensure that, if updating a tied operand pair, to only update that pair. Differential Revision: https://reviews.llvm.org/D49052 llvm-svn: 336593