[modules] Store Module metadata in per-Context EmbedderData

src/factory.cc

 // Copyright 2014 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/factory.h"
 
 #include "src/accessors.h"
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 1750 matching lines @@
   // To make it easy to hash Modules, we set a new symbol as the name of
   // SharedFunctionInfo representing this Module.
   Handle<Symbol> name_symbol = NewSymbol();
   code->set_name(*name_symbol);
 
   Handle<Module> module = Handle<Module>::cast(NewStruct(MODULE_TYPE));
   module->set_code(*code);
   module->set_exports(*exports);
   module->set_requested_modules(*requested_modules);
   module->set_flags(0);
-  module->set_embedder_data(isolate()->heap()->undefined_value());
   return module;
 }
 
 Handle<JSArrayBuffer> Factory::NewJSArrayBuffer(SharedFlag shared,
                                                 PretenureFlag pretenure) {
   Handle<JSFunction> array_buffer_fun(
       shared == SharedFlag::kShared
           ? isolate()->native_context()->shared_array_buffer_fun()
           : isolate()->native_context()->array_buffer_fun());
   CALL_HEAP_FUNCTION(isolate(), isolate()->heap()->AllocateJSObject(
@@ skipping 821 matching lines @@
     Handle<AccessorInfo> prototype =
         Accessors::FunctionPrototypeInfo(isolate(), attribs);
     AccessorConstantDescriptor d(Handle<Name>(Name::cast(prototype->name())),
                                  prototype, attribs);
     map->AppendDescriptor(&d);
   }
 }
 
 }  // namespace internal
 }  // namespace v8