Fix floating point issues on Windows.

runtime/platform/floating_point.h

Index: runtime/platform/floating_point.h
diff --git a/runtime/platform/floating_point.h b/runtime/platform/floating_point.h
new file mode 100644
index 0000000000000000000000000000000000000000..7adaa7339546aa5e4c918f4438ec4ef4ff332777
--- /dev/null
+++ b/runtime/platform/floating_point.h
@@ -0,0 +1,11 @@
+// Copyright (c) 2012, 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.
+
+#ifndef PLATFORM_FLOATING_POINT_H_
+#define PLATFORM_FLOATING_POINT_H_
+
+inline double fmod_ieee(double x, double y) { return fmod(x, y); }
+inline double atan2_ieee(double y, double x) { return atan2(y, x); }
+
+#endif  // PLATFORM_FLOATING_POINT_H_