[Bug libstdc++/121313] vector::insert_range causes self-move-assignment of elements when given an empty range

[gulackeg at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121313

--- Comment #1 from Vincent X <gulackeg at gmail dot com> ---
(In reply to Vincent X from comment #0)
> When given an empty range, libc++'s implementation of insert_range performs
> unnecessary self-move-assignments for each element in the vector. [...]

s/libc++/libstdc++/