Allow equality operation on mixed double/smi arguments.

tests/standalone/double_smi_comparison_test.dart

Index: tests/standalone/double_smi_comparison_test.dart
===================================================================
--- tests/standalone/double_smi_comparison_test.dart	(revision 0)
+++ tests/standalone/double_smi_comparison_test.dart	(revision 0)
@@ -0,0 +1,23 @@
+// Copyright (c) 2011, 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.
+// Test correct comparison (equality and relational) when mixing double and
+// Smi arguments. We convert Smi to doubles and to the operation. This is
+// not correct in 64-bit mode where not every Smi can be converted to a
+// double without loss of precision.
+// VMOptions=--optimization-counter-threshold=10 --no-use-osr
+
+import "package:expect/expect.dart";
+
+equalityFunc(a, b) => a == b;
+
+lessThanFunc(a, b) => a < b;
+
+main() {
+  for (int i = 0; i < 20; i++) {
+    Expect.isFalse(equalityFunc(1.0, 4));
+    Expect.isTrue(lessThanFunc(1.0, 4));
+  }
+  Expect.isFalse(equalityFunc(3459045988797251776, 3459045988797251777));
+  Expect.isTrue(lessThanFunc(3459045988797251776, 3459045988797251777));
+}