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This restores a lost setting of something_changed with the recent refactoring of the substitute and fold engine. The reported ICE in the PR was meanwhile mitigated in other ways but the issue can still result in missed optimizations via failed runs of CFG cleanup. 2020-07-29 Richard Biener <rguenther@suse.de> PR tree-optimization/95679 * tree-ssa-propagate.h (substitute_and_fold_engine::propagate_into_phi_args): Return whether anything changed. * tree-ssa-propagate.c (substitute_and_fold_engine::propagate_into_phi_args): Likewise. (substitute_and_fold_dom_walker::before_dom_children): Update something_changed.
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