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e077ef6e85
there may be other def(s) apart from the use&def two-address operand. We need to check if the register reuse for a use&def operand may conflicts with another def. Provide a mean to recover from the conflict if it is detected when the defs are processed later. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31439 91177308-0d34-0410-b5e6-96231b3b80d8