* tree-ssanames.c (make_ssa_name): No longer need to clear, then initialize key elements here. (release_ssa_name): Zero the released SSA_NAME here. * tree.h (SSA_NAME_EQUIV, SET_SSA_NAME_EQUIV): New macros. (struct tree_ssa_name): Add new "equiv" field. * tree-ssa-dom.c (const_and_copies): Kill the global varray. (tree_ssa_dominator_optimize): No longer allocate, resize or clear CONST_AND_COPIES. (get_value_for, set_value_for): Kill. (thread_across_edge): Get/set the equivalency using SSA_NAME_EQUIV and SET_SSA_NAME_EQUIV. (restore_vars_to_original_value): Likewise. (record_equivalences_from_phis): Likewise. (record_dominating_conditions): Likewise. (record_const_or_copy, record_equality): Likewise. (lookup_avail_expr): Likewise. (record_equivalences_from_stmt, cprop_operand): Likewise. (cprop_into_successor_phis): No longer need to pass around CONST_AND_COPIES. Callers updated. Get equivalences via SSA_NAME_EQUIV. (cprop_into_phis): Likewise. Co-Authored-By: Jan Hubicka <jh@suse.cz> From-SVN: r87787
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