fix #29753, use ES5 constructors for ddc

pkg/dev_compiler/test/codegen_expected/es6_modules.js

Index: pkg/dev_compiler/test/codegen_expected/es6_modules.js
diff --git a/pkg/dev_compiler/test/codegen_expected/es6_modules.js b/pkg/dev_compiler/test/codegen_expected/es6_modules.js
index 5e16c6dc8607c4ab4b4a4a7ddb715ae614fd70c3..25fc96b9791d2c145b3c5000dc3c23a512b9848a 100644
--- a/pkg/dev_compiler/test/codegen_expected/es6_modules.js
+++ b/pkg/dev_compiler/test/codegen_expected/es6_modules.js
@@ -6,15 +6,23 @@ let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.fnType(dart.dynamic
 let VoidToString = () => (VoidToString = dart.constFn(dart.fnType(core.String, [])))();
 es6_modules.Callback = dart.typedef('Callback', () => dart.fnTypeFuzzy(dart.void, [], {i: core.int}));
 es6_modules.A = class A extends core.Object {};
+(es6_modules.A.new = function() {
+}).prototype = es6_modules.A.prototype;
 es6_modules._A = class _A extends core.Object {};
+(es6_modules._A.new = function() {
+}).prototype = es6_modules._A.prototype;
 es6_modules.B$ = dart.generic(T => {
   class B extends core.Object {}
+  (B.new = function() {
+  }).prototype = B.prototype;
   dart.addTypeTests(B);
   return B;
 });
 es6_modules.B = B();
 es6_modules._B$ = dart.generic(T => {
   class _B extends core.Object {}
+  (_B.new = function() {
+  }).prototype = _B.prototype;
   dart.addTypeTests(_B);
   return _B;
 });