[Bug rust/30330] GDB 13.1 no longer prints length of Rust slice wrappers

["tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30330

--- Comment #3 from Tom Tromey <tromey at sourceware dot org> ---
> It doesn't have a *static* size at all -- it needs the reference's length.

Yeah, oops, sorry about that.
I guess we need some kind of type resolution that will rewrite
the size of the final field in an unsized struct.  Unfortunately
this doesn't seem to fit that well into how dynamic type resolution
is currently handled in gdb.  So maybe we need some Rust-specific
bit... Ada handles similar(-ish) cases entirely on its own but I think
it would be better to somehow hook into the generic code.

FWIW I can't gdb 12 to print anything really useful here.
You can inspect the data, a bit, but it isn't really obvious
and I even get some weird stuff:

(gdb) p *a.data_ptr
$2 = prog::Foo<[u8]> {
  value: 0
}
(gdb) p a.data_ptr.value
$3 = 97

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