fix #29753, use ES5 constructors for ddc

pkg/dev_compiler/test/codegen_expected/BenchmarkBase.js

 define(['dart_sdk'], function(dart_sdk) {
   'use strict';
   const core = dart_sdk.core;
   const dart = dart_sdk.dart;
   const dartx = dart_sdk.dartx;
   const BenchmarkBase$ = Object.create(null);
   let VoidToNull = () => (VoidToNull = dart.constFn(dart.fnType(core.Null, [])))();
   BenchmarkBase$.Expect = class Expect extends core.Object {
     static equals(expected, actual) {
       if (!dart.equals(expected, actual)) {
         dart.throw(dart.str`Values not equal: ${expected} vs ${actual}`);
       }
     }
     static listEquals(expected, actual) {
       if (expected[dartx.length] != actual[dartx.length]) {
         dart.throw(dart.str`Lists have different lengths: ${expected[dartx.length]} vs ${actual[dartx.length]}`);
       }
       for (let i = 0; i < dart.notNull(actual[dartx.length]); i++) {
         BenchmarkBase$.Expect.equals(expected[dartx._get](i), actual[dartx._get](i));
       }
     }
     fail(message) {
       dart.throw(message);
     }
   };
+  (BenchmarkBase$.Expect.new = function() {
+  }).prototype = BenchmarkBase$.Expect.prototype;
   dart.setSignature(BenchmarkBase$.Expect, {
     methods: () => ({fail: dart.fnType(dart.dynamic, [dart.dynamic])}),
     statics: () => ({
       equals: dart.fnType(dart.void, [dart.dynamic, dart.dynamic]),
       listEquals: dart.fnType(dart.void, [core.List, core.List])
     }),
     names: ['equals', 'listEquals']
   });
   BenchmarkBase$.BenchmarkBase = class BenchmarkBase extends core.Object {
     get name() {
       return this[name$];
     }
     set name(value) {
       super.name = value;
     }
-    new(name) {
-      this[name$] = name;
-    }
     run() {}
     warmup() {
       this.run();
     }
     exercise() {
       for (let i = 0; i < 10; i++) {
         this.run();
       }
     }
     setup() {}
     teardown() {}
     static measureFor(f, timeMinimum) {
       let time = 0;
       let iter = 0;
-      let watch = new core.Stopwatch();
+      let watch = new core.Stopwatch.new();
       watch.start();
       let elapsed = 0;
       while (dart.notNull(elapsed) < dart.notNull(timeMinimum)) {
         dart.dcall(f);
         elapsed = watch.elapsedMilliseconds;
         iter++;
       }
       return 1000.0 * dart.notNull(elapsed) / iter;
     }
     measure() {
       this.setup();
       BenchmarkBase$.BenchmarkBase.measureFor(dart.fn(() => {
         this.warmup();
       }, VoidToNull()), 100);
       let result = BenchmarkBase$.BenchmarkBase.measureFor(dart.fn(() => {
         this.exercise();
       }, VoidToNull()), 2000);
       this.teardown();
       return result;
     }
     report() {
       let score = this.measure();
       core.print(dart.str`${this.name}(RunTime): ${score} us.`);
     }
   };
+  (BenchmarkBase$.BenchmarkBase.new = function(name) {
+    this[name$] = name;
+  }).prototype = BenchmarkBase$.BenchmarkBase.prototype;
   const name$ = Symbol("BenchmarkBase.name");
   dart.setSignature(BenchmarkBase$.BenchmarkBase, {
     fields: () => ({name: dart.finalFieldType(core.String)}),
     methods: () => ({
       run: dart.fnType(dart.void, []),
       warmup: dart.fnType(dart.void, []),
       exercise: dart.fnType(dart.void, []),
       setup: dart.fnType(dart.void, []),
       teardown: dart.fnType(dart.void, []),
       measure: dart.fnType(core.double, []),
       report: dart.fnType(dart.void, [])
     }),
     statics: () => ({measureFor: dart.fnType(core.double, [core.Function, core.int])}),
     names: ['measureFor']
   });
   dart.trackLibraries("BenchmarkBase", {
     "BenchmarkBase.dart": BenchmarkBase$
   }, null);
   // Exports:
   return {
     BenchmarkBase: BenchmarkBase$
   };
 });