[Bug debug/83935] DWARF for a variant part is incorrect

[tromey at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83935

--- Comment #7 from Tom Tromey <tromey at gcc dot gnu.org> ---
For Rust I ended up following the letter of the standard, so I'm going
to follow this in the gdb patches as well.  That said, gdb can be adapted
to work with either approach, so it's not strictly necessary to change
gcc here, perhaps depending on resolution of that DWARF issue.