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

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

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

--- Comment #22 from Sourceware Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom Tromey <tromey@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=b0dd661fa16a424f059b1e1d80e779508b1a9a12

commit b0dd661fa16a424f059b1e1d80e779508b1a9a12
Author: Tom Tromey <tromey@adacore.com>
Date:   Tue Jan 30 10:06:46 2024 -0700

    Rewrite Rust slice type handling

    This patch rewrites the handling of slice types in Rust.

    More recent versions of the Rust compiler changed how unsized types
    were emitted, letting gdb inspect them more nicely.  However, gdb did
    not do this, and in fact treated all such types as if they were slices
    of arrays, which is incorrect.

    This patch rewrites this handling and removes the restriction that
    unsized types must be array slices.  I've added a comment explaining
    how unsized types are represented to rust-lang.c as well.

    I looked into a different approach, namely changing the DWARF reader
    to fix up slice types to have a dynamic type.  However, the approach
    taken here turned out to be simpler.

    Tested on x86-64 Fedora 38 with a variety of Rust compiler versions.

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

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