Check in codegen test expectations.

test/codegen/expect/language/try_catch_optimized4_test.js

+dart_library.library('language/try_catch_optimized4_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__try_catch_optimized4_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const _interceptors = dart_sdk._interceptors;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const try_catch_optimized4_test = Object.create(null);
+  let JSArrayOfObject = () => (JSArrayOfObject = dart.constFn(_interceptors.JSArray$(core.Object)))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  dart.defineLazy(try_catch_optimized4_test, {
+    get a() {
+      return JSArrayOfObject().of([1, 2, 3, 4, 5]);
+    },
+    set a(_) {}
+  });
+  try_catch_optimized4_test.MyError = class MyError extends core.Object {};
+  try_catch_optimized4_test.M = class M extends core.Object {
+    maythrow(i) {
+      try {
+        if (dart.test(dart.dsend(i, '<=', 5))) dart.throw(new try_catch_optimized4_test.MyError());
+      } catch (e) {
+        dart.throw(e);
+      }
+
+    }
+  };
+  dart.setSignature(try_catch_optimized4_test.M, {
+    methods: () => ({maythrow: dart.definiteFunctionType(dart.dynamic, [dart.dynamic])})
+  });
+  try_catch_optimized4_test.loop_test = function() {
+    let failed = false;
+    let m = new try_catch_optimized4_test.M();
+    for (let i of try_catch_optimized4_test.a) {
+      try {
+        let res = core.String._check(m.maythrow(i));
+        failed = true;
+      } catch (e) {
+        if (try_catch_optimized4_test.MyError.is(e)) {
+        } else
+          throw e;
+      }
+
+      if (!core.identical(failed, false)) {
+        expect$.Expect.fail("");
+      }
+    }
+  };
+  dart.fn(try_catch_optimized4_test.loop_test, VoidTodynamic());
+  try_catch_optimized4_test.main = function() {
+    for (let i = 0; i < 20; i++)
+      try_catch_optimized4_test.loop_test();
+  };
+  dart.fn(try_catch_optimized4_test.main, VoidTodynamic());
+  // Exports:
+  exports.try_catch_optimized4_test = try_catch_optimized4_test;
+});