[C++ PATCH] ctor privacy

[Nathan Sidwell]

While futzing around with ctor lookup I discovered this warning about 
overly-private classes.

Originally we'd allow a public copy-ctor to be sufficiently public, but 
as the comment says, you need an already-constructed object for that to 
work.  so this implements that check -- public copy or move ctors do not 
make the class sufficiently public.

I didn't implement the further suggested check of ignoring a ctor that 
takes an already constructed object -- be it copy ctor or not.

applied to trunk.

nathan
-- 
Nathan Sidwell
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