lib/CodeGen/PHIElimination.cpp

326     LiveInterval &DestLI = LIS->getInterval(DestReg);
327     assert(DestLI.begin() != DestLI.end() &&
329     if (DestLI.endIndex().isDead()) {
333       VNInfo *OrigDestVNI = DestLI.getVNInfoAt(MBBStartIndex);
335       DestLI.removeSegment(MBBStartIndex, MBBStartIndex.getDeadSlot());
336       DestLI.createDeadDef(DestCopyIndex.getRegSlot(),
338       DestLI.removeValNo(OrigDestVNI);
342       DestLI.removeSegment(MBBStartIndex, DestCopyIndex.getRegSlot());
343       VNInfo *DestVNI = DestLI.getVNInfoAt(DestCopyIndex.getRegSlot());