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gcc/ChangeLog: PR tree-optimization/20640 * tree-ssa-dce.c (remove_dead_stmt): Don't redirect edge to post-dominator if it has phi nodes. (eliminate_unnecessary_stmts): Remove dead phis in all blocks before dead statements. gcc/testsuite/ChangeLog: PR tree-optimization/20640 * gcc.dg/torture/tree-loop-1.c: New. From-SVN: r97446
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