improve comments yet again, now I know what this does :)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@53821 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/Sema.cpp

@@ -27,7 +27,9 @@ bool Sema::isBuiltinObjCType(TypedefDecl *TD) {
 }
 
 /// isObjCObjectPointerType - Returns true if type is an Objective-C pointer
-/// to an object type; such as "id", "Class", Intf*, id<P>, etc.
+/// to an object type.  This includes "id" and "Class" (two 'special' pointers
+/// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified
+/// ID type).
 bool Sema::isObjCObjectPointerType(QualType Ty) const {
   if (Ty->isObjCQualifiedIdType())
     return true;

lib/Sema/Sema.h

@@ -345,8 +345,10 @@ private:
   /// or "Protocol".
   bool isBuiltinObjCType(TypedefDecl *TD);
   
-  /// isObjCObjectPointerType - Returns true if type is an objective-c pointer
-  /// to an object type; such as "id", "Class", Intf*, id<P>, etc.
+  /// isObjCObjectPointerType - Returns true if type is an Objective-C pointer
+  /// to an object type.  This includes "id" and "Class" (two 'special' pointers
+  /// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified
+  /// ID type).
   bool isObjCObjectPointerType(QualType type) const;
 
   /// AddInstanceMethodToGlobalPool - All instance methods in a translation