Check in codegen test expectations.

test/codegen/expect/language/gvn_test.js

+dart_library.library('language/gvn_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__gvn_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const gvn_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  gvn_test.A = class A extends core.Object {
+    new() {
+      this.x = 0;
+    }
+    foo(i) {
+      let start = this.x;
+      do {
+        this.x = dart.notNull(this.x) + 1;
+        i = dart.dsend(i, '+', 1);
+      } while (!dart.equals(i, 10));
+    }
+  };
+  dart.setSignature(gvn_test.A, {
+    methods: () => ({foo: dart.definiteFunctionType(dart.dynamic, [dart.dynamic])})
+  });
+  gvn_test.main = function() {
+    let a = new gvn_test.A();
+    a.foo(0);
+    expect$.Expect.equals(10, a.x);
+  };
+  dart.fn(gvn_test.main, VoidTodynamic());
+  // Exports:
+  exports.gvn_test = gvn_test;
+});