[Bug libstdc++/65101] cppcheck for vector.tcc: Variable '__new_finish' is reassigned a value before the old one has been used.

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65101

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
i.e. __new_finish = pointer() is used as a check-point so the catch-block knows
whether an exception was thrown by _Alloc_traits::construct() or by
__uninitialized_move_if_noexcept_a(). That avoids having two try-catch blocks.