[cfe-dev] Fix for ObjC Class / id definition regression

[David Chisnall]

Hi,

The attached diff fixes the recently-introduced regression where clang  
ignores the definitions of the Objective-C types in a header (although  
not, I believe, from a precompiled header, although I'd need to check  
that).  The attached test.m is a preprocessed file including one of  
the GNU runtime headers which demonstrates the problem.  This will  
also be a problem with the legacy Apple runtime, but not with the  
modern runtime (where these types are opaque).

David
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