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MachineInstrSpan is initialized with a MachineBasicBlock::iterator, and is intended to track which instructions are inserted before/after that instruction from the time the MachineInstrSpan is created. It provides a begin()/end() interface to walk the range of instructions inserted around the initial instruction (including that initial instruction). It also provides a getInitial() interface to return the initial iterator. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188436 91177308-0d34-0410-b5e6-96231b3b80d8
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