fix maskedStore unit test for compilers where sizeof(Vector<T>::Memory) > sizeof(Vector<T>)
fix maskedStore unit test for compilers where sizeof(Vector<T>::Memory) > sizeof(Vector<T>)

chr-engwer/Vc,VcDevel/Vc,VcDevel/Vc,VcDevel/Vc,chr-engwer/Vc,chr-engwer/Vc,VcDevel/Vc