* hppa-tdep.c (skip_prologue): Do nothing if not at the beginning

    * hppa-tdep.c (skip_prologue): Do nothing if not at the beginning
        of a function.
        (skip_trampoline_code): Rewrite and add support for argument
        relocation stubs stubs, import/export stubs, calls through
        "_sr4export" and cascaded trampolines.