Adds a flag to the standalone vm to throw an exception on 53-bit integer overflow.

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
+
+
+import "package:expect/expect.dart";
+import 'dart:typed_data';
+
+
+int double_to_int_throws() {
+  double d = 1.9e16;
+  return d.toInt();
+}
+
+
+int integer_add_throws() {
+  return (1 << 52) + (1 << 52);
+}
+
+
+int i64list_throws() {
+  var i64l = new Int64List(16);
+  i64l[0] = (1 << 54);
+  return i64l[0];
+}
+
+
+int double_to_int() {
+  double d = 1.9e14;
+  return d.toInt();
+}
+
+
+int integer_add() {
+  return (1 << 50) + (1 << 50);
+}
+
+
+main() {
+  Expect.throws(double_to_int_throws, (e) => e is FiftyThreeBitOverflowError);
+  Expect.throws(integer_add_throws, (e) => e is FiftyThreeBitOverflowError);
+  Expect.throws(i64list_throws, (e) => e is FiftyThreeBitOverflowError);
+  Expect.equals(190000000000000, double_to_int());
+  Expect.equals(1 << 51, integer_add());
+}