Check in codegen test expectations.

test/codegen/expect/language/unicode_bom_test.js

Index: test/codegen/expect/language/unicode_bom_test.js
diff --git a/test/codegen/expect/language/unicode_bom_test.js b/test/codegen/expect/language/unicode_bom_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..b6b2b4fdcbc0566dcc8f1d705dc0025a075377ee
--- /dev/null
+++ b/test/codegen/expect/language/unicode_bom_test.js
@@ -0,0 +1,15 @@
+dart_library.library('language/unicode_bom_test', null, /* Imports */[
+  'dart_sdk'
+], function load__unicode_bom_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const unicode_bom_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  unicode_bom_test.main = function() {
+  };
+  dart.fn(unicode_bom_test.main, VoidTodynamic());
+  // Exports:
+  exports.unicode_bom_test = unicode_bom_test;
+});