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RenameIndependentSubregs: Fix handling of undef tied operands

Authored by msearles on Jul 9 2018, 1:07 PM.

Description

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

Details