73252d51d1
coverage: Simplify building the coverage graph with `CoverageSuccessors` This is a collection of simplifications to the code that builds the *basic coverage block* graph, which is a simplified view of the MIR control-flow graph that ignores panics and merges straight-line sequences of blocks into a single BCB node. The biggest change is to how we determine the coverage-relevant successors of a block. Previously we would call `Terminator::successors` and apply some ad-hoc postprocessing, but with this PR we instead have our own `match` on the terminator kind that produces a coverage-specific enum `CoverageSuccessors`. That enum also includes information about whether a block has exactly one successor that it can be chained into as part of a single BCB.
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