bb-reorder.c (find_traces_1_round): Don't connect easy to copy successors with multiple predecessors.

        * bb-reorder.c (find_traces_1_round): Don't connect easy to copy
        successors with multiple predecessors.
        (connect_traces): Try harder to copy traces of length 1.

        * function.h (struct function): Add computed_goto_common_label,
        computed_goto_common_reg.
        * function.c (free_after_compilation): Zap them.
        * stmt.c (expand_computed_goto): Use them to produce one
        indirect branch per function.

From-SVN: r62944