Fixes javascript integer overflow check.

tests/standalone/53bit_overflow_test.dart

-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// VMOptions=--throw_on_javascript_int_overflow --optimization_counter_threshold=10
-
-
-import "package:expect/expect.dart";
-import 'dart:typed_data';
-
-
-double dti_arg;
-int double_to_int() {
-  return dti_arg.toInt();
-}
-
-
-int ia_arg1;
-int ia_arg2;
-int integer_add() {
-  return ia_arg1 + ia_arg2;
-}
-
-
-int is_arg;
-int integer_shift() {
-  return is_arg << 1;
-}
-
-
-int max_add_throws() {
-  return 0xFFFFFFFFFFFFF + 1;
-}
-
-
-int min_sub_throws() {
-  return -0xFFFFFFFFFFFFF - 2;
-}
-
-
-int n_arg;
-int negate() {
-  return -n_arg;
-}
-
-
-int max_literal() {
-  return 0xFFFFFFFFFFFFF;
-}
-
-
-int min_literal() {
-  var min_literal = -0xFFFFFFFFFFFFF - 1;
-  return min_literal;
-}
-
-// We don't test for the _FiftyThreeBitOverflowError since it's not visible.
-// It's should not be visible since it doesn't exist on dart2js.
-bool is53BitError(e) => e is Error && "$e".startsWith("53-bit Overflow:");
-
-main() {
-  Expect.equals(0xFFFFFFFFFFFFF, max_literal());
-  Expect.equals(-0xFFFFFFFFFFFFF - 1, min_literal());
-
-  // Run the tests once before optimizations.
-  dti_arg = 1.9e16;
-  Expect.throws(double_to_int, is53BitError);
-
-  ia_arg1 = (1 << 51);
-  ia_arg2 = (1 << 51);
-  Expect.throws(integer_add, is53BitError);
-
-  n_arg = -0xFFFFFFFFFFFFF - 1;
-  Expect.throws(negate, is53BitError);
-
-  is_arg = (1 << 51);
-  Expect.throws(integer_shift, is53BitError);
-
-  Expect.throws(max_add_throws, is53BitError);
-  Expect.throws(min_sub_throws, is53BitError);
-
-  for (int i = 0; i < 20; i++) {
-    dti_arg = i.toDouble();
-    // Expect.throws calls through the closure, so we have to here, too.
-    var f = double_to_int;
-    Expect.equals(i, f());
-
-    ia_arg1 = i;
-    ia_arg2 = i;
-    f = integer_add;
-    Expect.equals(i + i, f());
-
-    n_arg = i;
-    f = negate;
-    Expect.equals(-i, f());
-
-    is_arg = i;
-    f = integer_shift;
-    Expect.equals(i << 1, f());
-  }
-
-   // The optimized functions should now deoptimize and throw the error.
-  dti_arg = 1.9e16;
-  Expect.throws(double_to_int, is53BitError);
-
-  ia_arg1 = (1 << 51);
-  ia_arg2 = (1 << 51);
-  Expect.throws(integer_add, is53BitError);
-
-  n_arg = -0xFFFFFFFFFFFFF - 1;
-  Expect.throws(negate, is53BitError);
-
-  is_arg = (1 << 51);
-  Expect.throws(integer_shift, is53BitError);
-
-  Expect.throws(max_add_throws, is53BitError);
-  Expect.throws(min_sub_throws, is53BitError);
-}