Change virtual methods in ArrayData to take Object pointer

Change virtual methods in ArrayData to take Object pointer

Pass a pointer to the underlying object instead of the ArrayData
to virtual methods that modify the arrayData. This prepares
for allocating the ArrayData together with the array itself.

Change-Id: I66fe187f8b1e4d382ab243a518dbde5f18a1d16d
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>