[modules] Add internal printer method for JSModuleNamespace.

src/objects-printer.cc

 // Copyright 2012 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.
 
 #include "src/objects.h"
 
 #include <iomanip>
 #include <memory>
 
 #include "src/disasm.h"
@@ skipping 148 matching lines @@
       break;
     case JS_MAP_ITERATOR_TYPE:
       JSMapIterator::cast(this)->JSMapIteratorPrint(os);
       break;
     case JS_WEAK_MAP_TYPE:
       JSWeakMap::cast(this)->JSWeakMapPrint(os);
       break;
     case JS_WEAK_SET_TYPE:
       JSWeakSet::cast(this)->JSWeakSetPrint(os);
       break;
+    case JS_MODULE_NAMESPACE_TYPE:
+      JSModuleNamespace::cast(this)->JSModuleNamespacePrint(os);
+      break;
     case FOREIGN_TYPE:
       Foreign::cast(this)->ForeignPrint(os);
       break;
     case SHARED_FUNCTION_INFO_TYPE:
       SharedFunctionInfo::cast(this)->SharedFunctionInfoPrint(os);
       break;
     case JS_MESSAGE_OBJECT_TYPE:
       JSMessageObject::cast(this)->JSMessageObjectPrint(os);
       break;
     case CELL_TYPE:
@@ skipping 982 matching lines @@
 void Module::ModulePrint(std::ostream& os) {  // NOLINT
   HeapObject::PrintHeader(os, "Module");
   os << "\n - code: " << Brief(code());
   os << "\n - exports: " << Brief(exports());
   os << "\n - requested_modules: " << Brief(requested_modules());
   os << "\n - evaluated: " << evaluated();
   os << "\n - embedder_data: " << Brief(embedder_data());
   os << "\n";
 }
 
+void JSModuleNamespace::JSModuleNamespacePrint(std::ostream& os) {  // NOLINT
+  HeapObject::PrintHeader(os, "JSModuleNamespace");
+  os << "\n - module: " << Brief(module());
+  os << "\n";
+}
+
 void PrototypeInfo::PrototypeInfoPrint(std::ostream& os) {  // NOLINT
   HeapObject::PrintHeader(os, "PrototypeInfo");
   os << "\n - prototype users: " << Brief(prototype_users());
   os << "\n - registry slot: " << registry_slot();
   os << "\n - validity cell: " << Brief(validity_cell());
   os << "\n";
 }
 
 void ContextExtension::ContextExtensionPrint(std::ostream& os) {  // NOLINT
   HeapObject::PrintHeader(os, "ContextExtension");
@@ skipping 358 matching lines @@
     printf("Not a transition array\n");
   } else {
     reinterpret_cast<i::TransitionArray*>(object)->Print();
   }
 }
 
 extern void _v8_internal_Print_StackTrace() {
   i::Isolate* isolate = i::Isolate::Current();
   isolate->PrintStack(stdout);
 }