Reland: [modules] Properly initialize declared variables.

src/bootstrapper.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/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/api-natives.h"
 #include "src/base/ieee754.h"
 #include "src/code-stubs.h"
@@ skipping 678 matching lines @@
                         static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
 
   JSObject::AddProperty(generator_object_prototype,
                         factory()->constructor_string(),
                         generator_function_prototype,
                         static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
   JSObject::AddProperty(generator_object_prototype,
                         factory()->to_string_tag_symbol(),
                         factory()->NewStringFromAsciiChecked("Generator"),
                         static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
-  SimpleInstallFunction(generator_object_prototype, "next",
-                        Builtins::kGeneratorPrototypeNext, 1, true);
+  Handle<JSFunction> next =
+      SimpleInstallFunction(generator_object_prototype, "next",
+                            Builtins::kGeneratorPrototypeNext, 1, true);
+  native_context()->set_generator_prototype_next(*next);
   SimpleInstallFunction(generator_object_prototype, "return",
                         Builtins::kGeneratorPrototypeReturn, 1, true);
   SimpleInstallFunction(generator_object_prototype, "throw",
                         Builtins::kGeneratorPrototypeThrow, 1, true);
 
   // Create maps for generator functions and their prototypes.  Store those
   // maps in the native context. The "prototype" property descriptor is
   // writable, non-enumerable, and non-configurable (as per ES6 draft
   // 04-14-15, section 25.2.4.3).
   Handle<Map> strict_function_map(strict_function_map_writable_prototype_);
@@ skipping 3481 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8