ObjC/ObjC++: Fix missing check that a class extension is declared before the class implementation

[Mike Stump]

On Dec 27, 2010, at 9:07 PM, Nicola Pero <nicola.pero@meta-innovation.com> wrote:
> This patch fixes the ObjC/ObjC++ compiler so that it detects when a class extension
> is chain after the class implementation, and produces the appropriate error.
> 
> Ok to commit to trunk ?

Ok.
>