Don't ignore classes in topologysb-4.8-head

When building the class topology, don't skip classes, even if we are not
going to generate code for them. This is necessary to get the topology
order correct in a case such as C derived from B derived from A, where B
is not generated, but initializing C depends on A being initialized
first. Without this change, there is no guaranteed ordering between A
and C in such a case.

(In particular, this comes up in the Photon test; Photon::ValueIdentity
derives from Photon::TemplateBase, which derives from Photon::Base.
However, this was not being reflected in the topology, and as a result,
it was just luck that the initialization order was correct anyway.)

Change-Id: I4b99a50acef3b06e77100a70f2db8236d06af2be
Reviewed-by: John Cummings <jcummings2@users.sf.net>

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