Do not enter forward class 'Protocol' in decl context.

Will do it later. Fixes pr5552.

llvm-svn: 89269

clang/lib/Sema/Sema.cpp

@@ -319,7 +319,7 @@ void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) {
                                 &Context.Idents.get("Protocol"),
                                 SourceLocation(), true);
     Context.setObjCProtoType(Context.getObjCInterfaceType(ProtocolDecl));
-    PushOnScopeChains(ProtocolDecl, TUScope);
+    PushOnScopeChains(ProtocolDecl, TUScope, false);
   }
   // Create the built-in typedef for 'id'.
   if (Context.getObjCIdType().isNull()) {

clang/test/SemaObjC/class-protocol.m

@@ -0,0 +1,6 @@
+// RUN: clang-cc  -fsyntax-only -verify %s
+// pr5552
+
+@interface Protocol 
+@end
+