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New function to erase a machine instruction and mark DBG_VALUE for removal. A DBG_VALUE is marked for removal when it references an operand defined in the instruction. Use the new function to cleanup code in dead machine instruction removal pass. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215580 91177308-0d34-0410-b5e6-96231b3b80d8