Implement rudimentary module linking.

src/objects-printer.cc

Index: src/objects-printer.cc
diff --git a/src/objects-printer.cc b/src/objects-printer.cc
index 2353a9520beba20495ec237ddc405f249dea68ae..7d6ef67a30780135544660dd7cc1d90f9032b299 100644
--- a/src/objects-printer.cc
+++ b/src/objects-printer.cc
@@ -135,6 +135,9 @@ void HeapObject::HeapObjectPrint(FILE* out) {
     case ODDBALL_TYPE:
       Oddball::cast(this)->to_string()->Print(out);
       break;
+    case JS_MODULE_TYPE:
+      JSModule::cast(this)->JSModulePrint(out);
+      break;
     case JS_FUNCTION_TYPE:
       JSFunction::cast(this)->JSFunctionPrint(out);
       break;
@@ -152,7 +155,7 @@ void HeapObject::HeapObjectPrint(FILE* out) {
       JSValue::cast(this)->value()->Print(out);
       break;
     case JS_DATE_TYPE:
-      JSDate::cast(this)->value()->Print(out);
+      JSDate::cast(this)->JSDatePrint(out);
       break;
     case CODE_TYPE:
       Code::cast(this)->CodePrint(out);
@@ -437,6 +440,19 @@ void JSObject::JSObjectPrint(FILE* out) {
 }
 
 
+void JSModule::JSModulePrint(FILE* out) {
+  HeapObject::PrintHeader(out, "JSModule");
+  PrintF(out, " - map = 0x%p\n", reinterpret_cast<void*>(map()));
+  PrintF(out, " - context = ");
+  context()->Print(out);
+  PrintElementsKind(out, this->map()->elements_kind());
+  PrintF(out, " {\n");
+  PrintProperties(out);
+  PrintElements(out);
+  PrintF(out, " }\n");
+}
+
+
 static const char* TypeToString(InstanceType type) {
   switch (type) {
     case INVALID_TYPE: return "INVALID";
@@ -483,6 +499,7 @@ static const char* TypeToString(InstanceType type) {
     case ODDBALL_TYPE: return "ODDBALL";
     case JS_GLOBAL_PROPERTY_CELL_TYPE: return "JS_GLOBAL_PROPERTY_CELL";
     case SHARED_FUNCTION_INFO_TYPE: return "SHARED_FUNCTION_INFO";
+    case JS_MODULE_TYPE: return "JS_MODULE";
     case JS_FUNCTION_TYPE: return "JS_FUNCTION";
     case CODE_TYPE: return "CODE";
     case JS_ARRAY_TYPE: return "JS_ARRAY";