Use this to store the loop-level counter needed by QCoreApplication
when determining when it is safe to delete an object.
This removes the hack to hijack the QEvent::d pointer (even though
the pointer is unused).
Change-Id: I91c0b1aa00235ec6e13feb30bf928e56d2f80026
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>