When we de-serialize an Objective-C protocol, hand it to the AST consumer so that we can create metadata

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@70003 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/PCHReader.cpp b/lib/Frontend/PCHReader.cpp
index bbe92a0..66f65db 100644
--- a/lib/Frontend/PCHReader.cpp
+++ b/lib/Frontend/PCHReader.cpp
@@ -2595,6 +2595,9 @@
         DeclGroupRef DG(Func);
         Consumer->HandleTopLevelDecl(DG);
       }
+    } else if (isa<ObjCProtocolDecl>(D)) {
+      DeclGroupRef DG(D);
+      Consumer->HandleTopLevelDecl(DG);
     }
   }