fix #29753, use ES5 constructors for ddc

pkg/dev_compiler/test/codegen_expected/node_modules.js

 '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.fnType(dart.dynamic, [])))();
 let VoidToString = () => (VoidToString = dart.constFn(dart.fnType(core.String, [])))();
 node_modules.Callback = dart.typedef('Callback', () => dart.fnTypeFuzzy(dart.void, [], {i: core.int}));
 node_modules.A = class A extends core.Object {};
+(node_modules.A.new = function() {
+}).prototype = node_modules.A.prototype;
 node_modules._A = class _A extends core.Object {};
+(node_modules._A.new = function() {
+}).prototype = node_modules._A.prototype;
 node_modules.B$ = dart.generic(T => {
   class B extends core.Object {}
+  (B.new = function() {
+  }).prototype = B.prototype;
   dart.addTypeTests(B);
   return B;
 });
 node_modules.B = B();
 node_modules._B$ = dart.generic(T => {
   class _B extends core.Object {}
+  (_B.new = function() {
+  }).prototype = _B.prototype;
   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());
@@ skipping 20 matching lines @@
       return "abc";
     }, VoidToString())();
   },
   set lazyMutable(_) {}
 });
 dart.trackLibraries("node_modules", {
   "node_modules.dart": node_modules
 }, null);
 // Exports:
 exports.node_modules = node_modules;