When the allocator rewrite a spill register with new virtual register, it replaces other operands of the same register. Watch out for situations where
only some of the operands are sub-register uses.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43776 91177308-0d34-0410-b5e6-96231b3b80d8
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