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When rematerializing an instruction that defines a super register that would be used by a physical subregisters we use the related physical super register for the definition. To keep the live-range information accurate, all the defined subregisters must be marked as dead def, otherwise the register allocation may miss some interferences. Working on a reduced test-case! <rdar://problem/16582185> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206060 91177308-0d34-0410-b5e6-96231b3b80d8