Fix crash-on-invalid in objc super property access

[jahanian]

LGTM.
- Fariborz

On Jan 19, 2015, at 11:57 AM, Jason Haslam <jason.haslam at gmail.com> wrote:

> The attached patch fixes PR21932. It’s a crash-on-invalid for cases like this:
> 
> @implementation IFaceNotFound (Foo)
> -(int) foo {
>  return super.foo;
> }
> @end
> 
> Jason
> 
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