[PATCH] Fix PR20619 - failure to define implicit copy ctor of a by val capture in a generic lambda

[Faisal Vali]

> We shouldn't mark the operation as used if the generic lambda itself appears in a dependent context. I would strongly prefer that we set the CurContext to the context surrounding the generic lambda before processing an implicit capture to handle that case.

But I thought this patch won't mark it as used if the enclosing context is dependent - since I explicitly check for that - what am I missing?

http://reviews.llvm.org/D6171