Fix for stabs documentation

[Ben dot Hutchings at Symbian dot Com]

This isn't really a patch, but I couldn't find any other contact
address for "the gdb developers".

Section 7.8 of the stabs documentation (at
http://sources.redhat.com/gdb/current/onlinedocs/stabs.html) says:

    The `@' type descriptor is for a member (class and variable)
    type. It is followed by type information for the offset basetype,
    a comma, and type information for the type of the field being
    pointed to. (FIXME: this is acknowledged to be gibberish. Can
    anyone say what really goes here?).

I suggest using something along the following lines:

    The `@' type descriptor is used together with the `*' type
    descriptor for a pointer-to-non-static-member-data type. It
    is followed by type information for the class (or union), a
    comma, and type information for the member data.

    The following C++ source:

        typedef int A::*int_in_a;

    generates the following stab:

        .stabs "int_in_a:t20=*21=@19,1",128,0,0,0

Ben.


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