Check in codegen test expectations.

test/codegen/expect/lib/typed_data/int32x4_bigint_test.js

Index: test/codegen/expect/lib/typed_data/int32x4_bigint_test.js
diff --git a/test/codegen/expect/lib/typed_data/int32x4_bigint_test.js b/test/codegen/expect/lib/typed_data/int32x4_bigint_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..c8579216246111c6d1b72bdbde43193d025bfc5d
--- /dev/null
+++ b/test/codegen/expect/lib/typed_data/int32x4_bigint_test.js
@@ -0,0 +1,21 @@
+dart_library.library('lib/typed_data/int32x4_bigint_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__int32x4_bigint_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const typed_data = dart_sdk.typed_data;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const int32x4_bigint_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  int32x4_bigint_test.main = function() {
+    let n = 18446744073709551617;
+    let x = typed_data.Int32x4.new(n, 0, 0, 0);
+    expect$.Expect.equals(x.x, 1);
+  };
+  dart.fn(int32x4_bigint_test.main, VoidTodynamic());
+  // Exports:
+  exports.int32x4_bigint_test = int32x4_bigint_test;
+});