[PATCH] Implement DR85: Redeclaration of member class

[David Majnemer]

The attached patch implements DR85 [*] which disallows the existence of a
declaration of a member class that isn't a forward declaration before it's
definition.

This means that the following would be disallowed:
class A {
  struct B; // note here
  struct B; // error here
};

as well as:
class C {
  struct B {}; // note here
  struct B; // error here
};

I'm very open to suggestions on the diagnostic, I couldn't think of a great
one that doesn't boil down to "this is forbidden because the standard says
so."

[*] http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#85

Thanks
-- 
David Majnemer
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