Check in codegen test expectations.

test/codegen/expect/language/liveness_test.js

+dart_library.library('language/liveness_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__liveness_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 liveness_test = Object.create(null);
+  let dynamicTodynamic = () => (dynamicTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  liveness_test.foo = function(x) {
+    let y = x;
+    for (let i = 0; i < 10; i++) {
+      x = dart.dsend(x, '+', 1);
+    }
+    return y;
+  };
+  dart.fn(liveness_test.foo, dynamicTodynamic());
+  liveness_test.main = function() {
+    expect$.Expect.equals(499, liveness_test.foo(499));
+  };
+  dart.fn(liveness_test.main, VoidTodynamic());
+  // Exports:
+  exports.liveness_test = liveness_test;
+});