[C++ PATCH] move ctors and assign (again)

[Nathan Sidwell]

In addition to the user-declared checkers, we also have a couple of 'do 
we have at all' predicates.  Used exactly once when completing a struct 
and determining the state of the appropriate LAZY flags.

Merged with the attached patch committed to trunk.  Now the two 
functions are stunningly similar a further merging may be in the near 
future ...

nathan
-- 
Nathan Sidwell
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