* gdb.c++/classes.exp, gdb.c++/derivation.exp,

    * gdb.c++/classes.exp, gdb.c++/derivation.exp,
        gdb.c++/inherit.exp, gdb.c++/method.exp,
        gdb.c++/namespace.exp, gdb.c++/templates.exp,
        gdb.c++/userdef.exp, gdb.c++/virtfunc.exp: Updates for v3 demangler
        and class layout support.