Check in codegen test expectations.

test/codegen/expect/language/regress_21998_2_test.js

Index: test/codegen/expect/language/regress_21998_2_test.js
diff --git a/test/codegen/expect/language/regress_21998_2_test.js b/test/codegen/expect/language/regress_21998_2_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..5874a4e5b73a4c1147cb6d4ca1546451fa64850d
--- /dev/null
+++ b/test/codegen/expect/language/regress_21998_2_test.js
@@ -0,0 +1,40 @@
+dart_library.library('language/regress_21998_2_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__regress_21998_2_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const math = dart_sdk.math;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const regress_21998_2_test = Object.create(null);
+  const regress_21998_lib1 = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  let StringAndStringAndStringToString = () => (StringAndStringAndStringToString = dart.constFn(dart.definiteFunctionType(core.String, [core.String, core.String, core.String])))();
+  regress_21998_2_test.main = function() {
+    expect$.Expect.equals(4, new regress_21998_2_test.C().m());
+  };
+  dart.fn(regress_21998_2_test.main, VoidTodynamic());
+  regress_21998_2_test.C = class C extends core.Object {
+    max(a) {
+      return a;
+    }
+    m() {
+      return this.max(math.max(core.int)(2, regress_21998_lib1.max('a', 'b', 'cd')[dartx.length]));
+    }
+  };
+  dart.setSignature(regress_21998_2_test.C, {
+    methods: () => ({
+      max: dart.definiteFunctionType(dart.dynamic, [dart.dynamic]),
+      m: dart.definiteFunctionType(dart.dynamic, [])
+    })
+  });
+  regress_21998_lib1.max = function(a, b, c) {
+    return dart.str`${a}${b}${c}`;
+  };
+  dart.fn(regress_21998_lib1.max, StringAndStringAndStringToString());
+  // Exports:
+  exports.regress_21998_2_test = regress_21998_2_test;
+  exports.regress_21998_lib1 = regress_21998_lib1;
+});