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When an instruction only writes sub-registers, it is still necessary to add an <imp-def> operand for the super-register. When reloading into a virtual register, rewriting will add the operand, but when loading directly into a virtual register, the <imp-def> operand is still necessary. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152095 91177308-0d34-0410-b5e6-96231b3b80d8
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