Move ObjectNotClosureException and ClosureArgumentMismatchException to patch file.

runtime/vm/exceptions.cc

Index: runtime/vm/exceptions.cc
diff --git a/runtime/vm/exceptions.cc b/runtime/vm/exceptions.cc
index 252d8f9c9b36d6df4205177fae840b4db1d5c864..9ec568672327541c4721e2838a94a987a1b06472 100644
--- a/runtime/vm/exceptions.cc
+++ b/runtime/vm/exceptions.cc
@@ -410,11 +410,11 @@ RawObject* Exceptions::Create(
       break;
     case kClosureArgumentMismatch:
       library = Library::CoreLibrary();
-      class_name = Symbols::New("ClosureArgumentMismatchException");
+      class_name = Symbols::New("_ClosureArgumentMismatchException");
       break;
     case kObjectNotClosure:
       library = Library::CoreLibrary();
-      class_name = Symbols::New("ObjectNotClosureException");
+      class_name = Symbols::New("_ObjectNotClosureException");
       break;
     case kFormat:
       library = Library::CoreLibrary();