rtlanal: Change return type of predicate functions from int to bool

rtlanal: Change return type of predicate functions from int to bool

gcc/ChangeLog:

	* rtl.h (rtx_addr_can_trap_p): Change return type from int to bool.
	(rtx_unstable_p): Ditto.
	(reg_mentioned_p): Ditto.
	(reg_referenced_p): Ditto.
	(reg_used_between_p): Ditto.
	(reg_set_between_p): Ditto.
	(modified_between_p): Ditto.
	(no_labels_between_p): Ditto.
	(modified_in_p): Ditto.
	(reg_set_p): Ditto.
	(multiple_sets): Ditto.
	(set_noop_p): Ditto.
	(noop_move_p): Ditto.
	(reg_overlap_mentioned_p): Ditto.
	(dead_or_set_p): Ditto.
	(dead_or_set_regno_p): Ditto.
	(find_reg_fusage): Ditto.
	(find_regno_fusage): Ditto.
	(side_effects_p): Ditto.
	(volatile_refs_p): Ditto.
	(volatile_insn_p): Ditto.
	(may_trap_p_1): Ditto.
	(may_trap_p): Ditto.
	(may_trap_or_fault_p): Ditto.
	(computed_jump_p): Ditto.
	(auto_inc_p): Ditto.
	(loc_mentioned_in_p): Ditto.
	* rtlanal.cc (computed_jump_p_1): Adjust forward declaration.
	(rtx_unstable_p): Change return type from int to bool
	and adjust function body accordingly.
	(rtx_addr_can_trap_p): Ditto.
	(reg_mentioned_p): Ditto.
	(no_labels_between_p): Ditto.
	(reg_used_between_p): Ditto.
	(reg_referenced_p): Ditto.
	(reg_set_between_p): Ditto.
	(reg_set_p): Ditto.
	(modified_between_p): Ditto.
	(modified_in_p): Ditto.
	(multiple_sets): Ditto.
	(set_noop_p): Ditto.
	(noop_move_p): Ditto.
	(reg_overlap_mentioned_p): Ditto.
	(dead_or_set_p): Ditto.
	(dead_or_set_regno_p): Ditto.
	(find_reg_fusage): Ditto.
	(find_regno_fusage): Ditto.
	(remove_node_from_insn_list): Ditto.
	(volatile_insn_p): Ditto.
	(volatile_refs_p): Ditto.
	(side_effects_p): Ditto.
	(may_trap_p_1): Ditto.
	(may_trap_p): Ditto.
	(may_trap_or_fault_p): Ditto.
	(computed_jump_p): Ditto.
	(auto_inc_p): Ditto.
	(loc_mentioned_in_p): Ditto.
	* combine.cc (can_combine_p): Update indirect function.