[modules] Add internal printer method for JSModuleNamespace.

src/objects.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 #include <memory>
 
@@ skipping 7863 matching lines @@
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSGeneratorObject);
 };
 
 // When importing a module namespace (import * as foo from "bar"), a
 // JSModuleNamespace object (representing module "bar") is created and bound to
 // the declared variable (foo).  A module can have at most one namespace object.
 class JSModuleNamespace : public JSObject {
  public:
   DECLARE_CAST(JSModuleNamespace)
+  DECLARE_PRINTER(JSModuleNamespace)
   DECLARE_VERIFIER(JSModuleNamespace)
 
   // The actual module whose namespace is being represented.
   DECL_ACCESSORS(module, Module)
 
   // Retrieve the value exported by [module] under the given [name]. If there is
   // no such export, return Just(undefined). If the export is uninitialized,
   // schedule an exception and return Nothing.
   MUST_USE_RESULT MaybeHandle<Object> GetExport(Handle<String> name);
 
@@ skipping 3556 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_