Initialize a deleter for a new object, created by
QSharedPointer::create(), only after the object is actually
constructed.
[ChangeLog][QtCore][QSharedPointer] Fixed undefined behavior when
creating an object with QSharedPointer::create() and its conscructor
throws an exception.
Task-number: QTBUG-49824
Change-Id: I07f77a78ff468d9b45b8ef133278e8cdd96a0647
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>