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TwoAddressInstructionPass should annotate instructions with <undef> flags when it lower REG_SEQUENCE instructions. LiveIntervals should not be in the business of modifying code (except for kill flags, perhaps). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141187 91177308-0d34-0410-b5e6-96231b3b80d8