[Bug libstdc++/65839] xmethods need updating once gdb decides how to fix 18285

[dje at google dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65839

--- Comment #3 from Doug Evans <dje at google dot com> ---
[fyi]
Here's the tentative patch for gdb.
https://sourceware.org/ml/gdb-patches/2015-04/msg00947.html