Reland: [modules] Properly initialize declared variables.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 6f5dcff189a37235eb57ea0ec26a8d18c136c5c4..32df9810c4e279f57b7f2e703ca2875e2aaa16e6 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -696,8 +696,10 @@ void Genesis::CreateIteratorMaps(Handle<JSFunction> empty) {
                         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",