* rtl.h (rtx_format): Constify a char*.

	* rtl.c (rtx_format): Likewise.
	(copy_rtx, copy_most_rtx, read_rtx): Likewise.
	(init_rtl): Use accessor macro, not `rtx_format'.

	* alias.c (rtx_equal_for_memref_p, find_symbolic_term): Constify a
	char*.

	* caller-save.c (mark_referenced_regs): Likewise.

	* combine.c (subst, make_compound_operation, known_cond,
	gen_rtx_combine, update_table_tick, get_last_value_validate,
	use_crosses_set_p, mark_used_regs_combine, move_deaths): Likewise.

	* cse.c (rtx_cost, mention_regs, canon_hash, exp_equiv_p,
	refers_to_p, canon_reg, fold_rtx, cse_process_notes,
	count_reg_usage): Likewise.

	* emit-rtl.c (gen_rtx, copy_rtx_if_shared, reset_used_flags):
	Likewise.

	* final.c (leaf_renumber_regs_insn): Likewise.

	* flow.c (mark_used_regs, find_use_as_address, dump_flow_info,
	dump_edge_info, count_reg_references): Likewise.

	* function.c (fixup_var_refs_1, walk_fixup_memory_subreg,
	fixup_stack_1, purge_addressof_1, instantiate_virtual_regs_1):
	Likewise.

	* gcse.c (oprs_unchanged_p, hash_expr_1, expr_equiv_p,
	oprs_not_set_p, expr_killed_p, compute_transp, find_used_regs,
	add_label_notes): Likewise.

	* genattrtab.c (attr_rtx, attr_copy_rtx, encode_units_mask,
	clear_struct_flag, count_sub_rtxs, count_alternatives,
	compares_alternatives_p, contained_in_p, walk_attr_value,
	write_expr_attr_cache): Likewise.

	* genconfig.c (walk_insn_part): Likewise.

	* genemit.c (max_operand_1, gen_exp): Likewise.

	* genextract.c (walk_rtx): Likewise.

	* genflags.c (num_operands): Likewise.

	* genoutput.c (scan_operands): Likewise.

	* genpeep.c (match_rtx): Likewise.

	* genrecog.c (add_to_sequence): Likewise.

	* haifa-sched.c (may_trap_exp, sched_analyze_2, attach_deaths):
	Likewise.

	* integrate.c (save_constants, copy_for_inline,
	copy_rtx_and_substitute, subst_constants, restore_constants):
	Likewise.

	* jump.c  (mark_jump_label, invert_exp, redirect_exp,
	rtx_renumbered_equal_p, rtx_equal_for_thread_p): Likewise.

	* local-alloc.c (contains_replace_regs, memref_referenced_p):
	Likewise.

	* loop.c (record_excess_regs, rtx_equal_for_loop_p,
	add_label_notes, replace_call_address, count_nonfixed_reads,
	invariant_p, find_single_use_in_loop, find_mem_givs,
	find_life_end, maybe_eliminate_biv_1, update_reg_last_use):
	Likewise.

	* print-rtl.c (reg_names, print_rtx): Likewise.

	* recog.c (validate_replace_rtx_1, find_single_use_1): Likewise.

	* reg-stack.c (stack_regs_mentioned_p, record_label_references,
	record_reg_life_pat, swap_rtx_condition, goto_block_pat,
	print_blocks): Likewise.

	* regclass.c (fix_register, record_address_regs,
	reg_scan_mark_refs): Likewise.

	* regmove.c (stable_but_for_p): Likewise.

	* reload.c (loc_mentioned_in_p, operands_match_p,
	find_reloads_toplevsubst_reg_equivs, find_reloads_address_1,
	copy_replacements, refers_to_regno_for_reload_p,
	refers_to_mem_for_reload_p, find_inc_amount, regno_clobbered_p,
	reload_when_needed_name, reg_class_names, debug_reload_to_stream):
	Likewise.

	* reload1.c (eliminate_regs, scan_paradoxical_subregs,
	delete_address_reloads_1, count_occurrences,
	reload_cse_mem_conflict_p, reload_combine_note_use,
	add_auto_inc_notes): Likewise.

	* resource.c (mark_referenced_resources, mark_set_resources):
	Likewise.

	* rtlanal.c (rtx_unstable_p, rtx_varies_p, rtx_addr_varies_p,
	reg_mentioned_p, regs_set_between_p, modified_between_p,
	modified_in_p, refers_to_regno_p, reg_overlap_mentioned_p,
	rtx_equal_p, volatile_insn_p, volatile_refs_p, side_effects_p,
	may_trap_p, inequality_comparisons_p, replace_rtx, replace_regs,
	jmp_uses_reg_or_mem, for_each_rtx, regno_use_in): Likewise.

	* sched.c (sched_analyze_2, attach_deaths): Likewise.

	* stupid.c (stupid_mark_refs): Likewise.

	* unroll.c (remap_split_bivs): Likewise.

	* varasm.c (mark_constants): Likewise.

	* a29k/a29k.c (uses_local_reg_p): Likewise.

	* alpha/alpha.c (summarize_insn): Likewise.

	* arm/arm.c (symbol_mentioned_p, label_mentioned_p,
	eliminate_lr2ip): Likewise.

	* arm/thumb.c (symbol_mentioned_p, label_mentioned_p): Likewise.

	* i386/i386.c (symbolic_reference_mentioned_p, copy_all_rtx,
	reg_mentioned_in_mem): Likewise.

	* ns32k/ns32k.c (global_symbolic_reference_mentioned_p,
	symbolic_reference_mentioned_p): Likewise.

	* romp/romp.c (unsigned_comparisons_p, hash_rtx): Likewise.

	* sh/sh.c (regs_used, mark_use): Likewise.

	* vax/vax.c (vax_rtx_cost): Likewise.

From-SVN: r28784