patch: fix odr of pure virtual operator()

[Richard Smith]

We seem to have the same issue in CreateOverloadedUnaryOp,
CreateOverloadedBinOp, CreateOverloadedArraySubscriptExpr, and
BuildOverloadedArrowExpr.

How about moving the call to MarkFunctionReferenced (and DiagnoseUseOfDecl)
into CreateFunctionRefExpr, and changing it to call MarkDeclRefReferenced?

On Tue, Feb 5, 2013 at 10:48 PM, Nick Lewycky <nlewycky at google.com> wrote:

> This patch changes Sema::BuildCallToObjectOfClassType to not mark a
> virtual operator() as odr used when called via functor syntax "(*obj)();".
> There's no way this syntax can be used to call the body of a pure virtual
> function. Please review!
>
> Nick
>
>
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