CXX11 patch to warn if 'override' is missing on overriding virtual function

[Argyrios Kyrtzidis]

> On Sep 25, 2014, at 11:24 AM, Douglas Gregor <dgregor at apple.com> wrote:
> 
>  I’d feel a lot better if some part of the warning could be on by default. For example, if you’ve uttered “override” at least once in a class, it makes sense to warn-by-default about any other overrides in that class that weren’t marked as “override”, because you’re being locally inconsistent. Or maybe you can expand that heuristic out to a file-level granularity (which matches better for the null point constant warning) and still be on-by-default.

This seems like a great idea to me!
For the 'override' I much prefer if it is class specific to make it less of a burden as an “always on” warning. We could have the checking done at the end of the class definition.

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