* libgcc2.c (__throw): New routine.
        (__eh_pc): New data object for exception handling.

        * except.c (eh_saved_pc): New object so we can call
        assemble_external.
        (expand_internal_throw_indirect): Call assemble_external for
        __eh_pc.
        (end_eh_unwinder): Ditto.
        (init_eh): Initialize eh_saved_pc.
fixes eh6.C on rs6000 and alpha

From-SVN: r12646