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 685 matching lines @@
                         factory()->to_string_tag_symbol(),
                         factory()->NewStringFromAsciiChecked("Generator"),
                         static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY));
   SimpleInstallFunction(generator_object_prototype, "next",
                         Builtins::kGeneratorPrototypeNext, 1, true);
   SimpleInstallFunction(generator_object_prototype, "return",
                         Builtins::kGeneratorPrototypeReturn, 1, true);
   SimpleInstallFunction(generator_object_prototype, "throw",
                         Builtins::kGeneratorPrototypeThrow, 1, true);
 
+  // Internal version of generator_prototype_next, flagged as non-native.
+  Handle<JSFunction> generator_next_internal =
+      SimpleCreateFunction(isolate(), factory()->next_string(),
+                           Builtins::kGeneratorPrototypeNext, 1, true);
+  native_context()->set_generator_next_internal(*generator_next_internal);
+
   // 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_);
   // Generator functions do not have "caller" or "arguments" accessors.
   Handle<Map> sloppy_generator_function_map =
       Map::Copy(strict_function_map, "SloppyGeneratorFunction");
   sloppy_generator_function_map->set_is_constructor(false);
   Map::SetPrototype(sloppy_generator_function_map,
@@ skipping 3469 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8