Teach CursorVisitor about duplicate ObjCPropertyDecls that can arise because of a current
design limitation in how we handle Objective-C class extensions.  This was causing the CursorVisitor
to essentially visit an @property twice (once in the @interface, the other in the class extension).
Fixes <rdar://problem/7410145>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@104055 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/Sema.h b/lib/Sema/Sema.h
index 975516f..432e9e7 100644
--- a/lib/Sema/Sema.h
+++ b/lib/Sema/Sema.h
@@ -1597,7 +1597,8 @@
                                        const bool isAssign,
                                        const bool isReadWrite,
                                        const unsigned Attributes, QualType T,
-                                       tok::ObjCKeywordKind MethodImplKind);
+                                       tok::ObjCKeywordKind MethodImplKind,
+                                       DeclContext *lexicalDC = 0);
 
   /// AtomicPropertySetterGetterRules - This routine enforces the rule (via
   /// warning) when atomic property has one but not the other user-declared