[PATCH] Add FilteredArgList to represent filtered arglist

[Rui Ueyama]

> > +/// FilteredArgList - ArgList with filters. Useful to be used in
> > +/// range-based for loop to iterate over filtered arguments.
>
> Could we just have/use a generic range abstraction (essentially a simple
> class template with two iterator members, one returned by begin, the other
> by end) rather than writing a custom type here?
>
What if begin is called twice? Is it okay to return the same object, not a
new one?
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