Bug: Vector from no-default constructible class produces CE

[bivafra]

Problem

When Vector is instantiated from class that has not default c-tor, every method that uses pushingRealloc(...) with PushDecide::kNoPush will produce CE. It happens at the 543 line - there are no args to pass to allocator's construct(...), thus, it is instantiated without args and it calls default c-tor. However, with PushDecide::kNoPush there aren't calls to default c-tor, so it shouldn't be instantiated.

Possible solution

Refactor code to instantiate construct(...) only when needed.