Enable DDC output to run on v8/d8 using ES6 modules

pkg/dev_compiler/test/codegen_expected/node_modules.js

-(function() {
-  'use strict';
-  const dart_sdk = require('dart_sdk');
-  const core = dart_sdk.core;
-  const dart = dart_sdk.dart;
-  const dartx = dart_sdk.dartx;
-  const node_modules = Object.create(null);
-  let B = () => (B = dart.constFn(node_modules.B$()))();
-  let _B = () => (_B = dart.constFn(node_modules._B$()))();
-  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
-  let VoidToString = () => (VoidToString = dart.constFn(dart.definiteFunctionType(core.String, [])))();
-  node_modules.Callback = dart.typedef('Callback', () => dart.functionType(dart.void, [], {i: core.int}));
-  node_modules.A = class A extends core.Object {};
-  node_modules._A = class _A extends core.Object {};
-  node_modules.B$ = dart.generic(T => {
-    class B extends core.Object {}
-    dart.addTypeTests(B);
-    return B;
-  });
-  node_modules.B = B();
-  node_modules._B$ = dart.generic(T => {
-    class _B extends core.Object {}
-    dart.addTypeTests(_B);
-    return _B;
-  });
-  node_modules._B = _B();
-  node_modules.f = function() {
-  };
-  dart.fn(node_modules.f, VoidTodynamic());
-  node_modules._f = function() {
-  };
-  dart.fn(node_modules._f, VoidTodynamic());
-  node_modules.constant = "abc";
-  node_modules.finalConstant = "abc";
-  dart.defineLazy(node_modules, {
-    get lazy() {
-      return dart.fn(() => {
-        core.print('lazy');
-        return "abc";
-      }, VoidToString())();
-    }
-  });
-  node_modules.mutable = "abc";
-  dart.defineLazy(node_modules, {
-    get lazyMutable() {
-      return dart.fn(() => {
-        core.print('lazyMutable');
-        return "abc";
-      }, VoidToString())();
-    },
-    set lazyMutable(_) {}
-  });
-  // Exports:
-  exports.node_modules = node_modules;
-})();
+'use strict';
+const dart_sdk = require('dart_sdk');
+const core = dart_sdk.core;
+const dart = dart_sdk.dart;
+const dartx = dart_sdk.dartx;
+const node_modules = Object.create(null);
+let B = () => (B = dart.constFn(node_modules.B$()))();
+let _B = () => (_B = dart.constFn(node_modules._B$()))();
+let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+let VoidToString = () => (VoidToString = dart.constFn(dart.definiteFunctionType(core.String, [])))();
+node_modules.Callback = dart.typedef('Callback', () => dart.functionType(dart.void, [], {i: core.int}));
+node_modules.A = class A extends core.Object {};
+node_modules._A = class _A extends core.Object {};
+node_modules.B$ = dart.generic(T => {
+  class B extends core.Object {}
+  dart.addTypeTests(B);
+  return B;
+});
+node_modules.B = B();
+node_modules._B$ = dart.generic(T => {
+  class _B extends core.Object {}
+  dart.addTypeTests(_B);
+  return _B;
+});
+node_modules._B = _B();
+node_modules.f = function() {
+};
+dart.fn(node_modules.f, VoidTodynamic());
+node_modules._f = function() {
+};
+dart.fn(node_modules._f, VoidTodynamic());
+node_modules.constant = "abc";
+node_modules.finalConstant = "abc";
+dart.defineLazy(node_modules, {
+  get lazy() {
+    return dart.fn(() => {
+      core.print('lazy');
+      return "abc";
+    }, VoidToString())();
+  }
+});
+node_modules.mutable = "abc";
+dart.defineLazy(node_modules, {
+  get lazyMutable() {
+    return dart.fn(() => {
+      core.print('lazyMutable');
+      return "abc";
+    }, VoidToString())();
+  },
+  set lazyMutable(_) {}
+});
+// Exports:
+exports.node_modules = node_modules;