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* tree-ssa-dom.c (block_defs_stack): Remove, no longer needed. (restore_currdefs_to_original_value): Likewise. (register_definitions_for_stmt): Likewise. (tree_ssa_dominator_optimize): No longer initialize CURRENT_DEF for each variable. Do not allocate/free block_defs_stack either. Do not iterate if we just thread jumps. Only iterate if the tree_cleanup_cfg does useful work (temporary). (dom_opt_initialize_block): No longer push a marker on BLOCK_DEFS_STACK. (dom_opt_finalize_block): Removal call to restore currdefs. Relax restrictions for recording edge equivalences. (record_equivalences_from_phis): No longer need to track CURRENT_DEF. (optimize_stmt): Similarly. (thread_across_edge): Simplify by removing the requirement that statements in the block we are threading through must be nops. (initialize_hash_element): Handle GOTO_EXPR. From-SVN: r98597
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