Speed up rendering huge static scenes

With really big, static scenes, traversal of the geometry list
is expensive enough that it becomes a limitation on the frame
rate if we do it in the inner loop of every frame. And going
through the whole list of geometry every frame just to verify
that nothing has been removed is a waste of time.

In a test with two million opaque items in a single draw call,
I can hit 144 fps with this small optimization versus 50 fps
on the same machine without the patch.

Pick-to: 5.15
Change-Id: Id11c1d96456e79a62c33b89e5f115bdaacceeacd
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

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