Check in codegen test expectations.

test/codegen/expect/language/named_parameter_regression_test.js

+dart_library.library('language/named_parameter_regression_test', null, /* Imports */[
+  'dart_sdk'
+], function load__named_parameter_regression_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const named_parameter_regression_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  named_parameter_regression_test.Fisk = class Fisk extends core.Object {
+    foo(opts) {
+      let b = opts && 'b' in opts ? opts.b : null;
+      let a = opts && 'a' in opts ? opts.a : true;
+      if (b == null) return;
+      dart.throw('broken');
+    }
+    bar(opts) {
+      let a = opts && 'a' in opts ? opts.a : null;
+      let b = opts && 'b' in opts ? opts.b : true;
+      if (a == null) return;
+      dart.throw('broken');
+    }
+  };
+  dart.setSignature(named_parameter_regression_test.Fisk, {
+    methods: () => ({
+      foo: dart.definiteFunctionType(dart.dynamic, [], {b: dart.dynamic, a: dart.dynamic}),
+      bar: dart.definiteFunctionType(dart.dynamic, [], {a: dart.dynamic, b: dart.dynamic})
+    })
+  });
+  named_parameter_regression_test.main = function() {
+    new named_parameter_regression_test.Fisk().foo({a: true});
+    new named_parameter_regression_test.Fisk().bar({b: true});
+  };
+  dart.fn(named_parameter_regression_test.main, VoidTodynamic());
+  // Exports:
+  exports.named_parameter_regression_test = named_parameter_regression_test;
+});