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3b9d7037c9
`BcbBranch` represented an out-edge of a coverage graph node, but would silently refer to a node instead in cases where that node only had one in-edge. Instead we now refer to a graph edge as a `(from_bcb, to_bcb)` pair, or sometimes as just one of those nodes when the other node is implied by the surrounding context. The case of sole in-edges is handled by special code added directly to `get_or_make_edge_counter_operand`.