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It's tree_redirect_edge_and_branch that is quadratic if most outgoing edges of a block ending in a SWITCH_EXPR are critical edges.
(Note that pass_split_crit_edges really shouldn't be a pass. It only provides a property, PROP_no_crit_edges, but it's run unconditionally,
so even with -fno-tree-pre (which is the only pass that requires this property) we still run the pass_split_crit_edges pass - wasteful!)
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