* cgraph.h (varpool_first_static_initializer,
	varpool_next_static_initializer): Make checking only when
	checking enabled.
	* tree-vectorizer.h (vinfo_for_stmt): Remove check.
	(set_vinfo_for_stmt, get_earlier_stmt, is_loop_header_bb_p): Change
	gcc_assert to gcc_checking_assert.
	* tree-flow-inline.h (gimple_vop, get_var_ann, relink_imm_use, phi_nodes
	set_phi_nodes, phi_arg_index_from_use, op_iter_next_use,
	op_iter_next_def, op_iter_next_tree, op_iter_init, op_iter_init_use,
	op_iter_init_phiuse, op_iter_init_phidef, array_ref_contains_indirect_ref,
	ref_contains_array_ref): Use gcc_checking_assert.
	* emit-rtl.h (set_first_insn, set_last_insn): Likewise.
	* tree-ssa-live.h (var_to_partition, var_to_partition_to_var,
	partition_is_global, live_on_entry, live_on_exit,
	live_merge_and_clear): Likewise.
	* system.h (gcc_checking_assert): New macro.

From-SVN: r160489