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.

Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.

OK for master?

Uros.