[PATCH] Emit the DIType for ObjC 'id<protocol>' as 'id' rather than objc_object* (fixes rdar://problem/12601916)

[Adrian Prantl]

Hi CFEes,

please review the following patch:

Emit the DIType for ObjC 'id<protocol>' as 'id' rather than objc_object* 
Fix for rdar://problem/12601916.

The frontend treats 'id' as a typedef to an ObjCObjectType, 
whereas 'id<protocol>' is treated as an ObjCPointerType. For the
debug info, we want to emit 'id' in both cases. 

cheers,
Adrian

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