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This makes sure to roll-back the whole SCC when we fail stmt analysis, otherwise the optimistic visited treatment breaks down with different entries. Rollback is easy when tracking additions to visited in a vector which also makes the whole thing cheaper than the two hash-sets used before. 2020-10-30 Richard Biener <rguenther@suse.de> PR tree-optimization/97626 * tree-vect-slp.c (vect_slp_analyze_node_operations): Exchange the lvisited hash-set for a vector, roll back recursive adds to visited when analysis failed. (vect_slp_analyze_operations): Likewise. * gcc.dg/vect/bb-slp-pr97626.c: New testcase.
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