* tree-ssa-dom.c (nonzero_vars_stack, vrp_variables_stack): New
global varrays to replace the block local varrays.
(struct dom_walk_block_data): Remove, no longer used.
(get_eq_expr_value): No longer need to pass around pointers to local
varrays. Callers updated. Unused markers added to unused parameters.
(record_range, record_equivalences_from_stmt): Likewise.
(record_equivalences_from_incoming_edge): Likewise.
(record_var_is_nonzero): Likewise. Update now that we have a
single global varray of SSA_NAMEs that need restoring.
(dom_opt_initialize_block_local_data): Kill, no longer used.
(tree_ssa_dominator_optimize): Initialize new global varrays.
Update callbacks in dominator walker structure.
(dom_opt_initialize_block): Add markers to NONZERO_VAR_STACK and
VRP_VARIABLES_STACK.
(restore_nonzero_vars_to_original_value): Update now that we have
a single global varray of SSA_NAMEs that need restoring.
(dom_opt_finalize_block): Similarly for VRP_VARIABLES_STACK.
Remove unused variables.
(optimize_stmt): Remove unused variable.
From-SVN: r87719
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