[Bug libstdc++/78595] Unnecessary copies in _Rb_tree

[ville.voutilainen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78595

Ville Voutilainen <ville.voutilainen at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|7.0                         |unknown

--- Comment #5 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
Jonathan and I looked at this, and a proper fix requires teaching the functions
in bits/stl_tree.h new tricks. That's not stage3 material, so let's punt this
to 8.