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Hi, there! There are situations where a machine basic block has to be split into two machine basic blocks, e.g., to place a constant pool entry or to fix a conditional branch so that its target is within its range (https://reviews.llvm.org/D38918). However, it doesn't appear to be straightforward how the control flow graph should be updated when a machine basic block is split, especially when the split point is between two branches. In this case, in order to determine the successors of each of the two machine basic block, one needs...