Implement trigonometric functions using a fdlibm port.

src/rempio2.h

Index: src/rempio2.h
diff --git a/src/rempio2.h b/src/rempio2.h
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+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// ====================================================
+// Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+//
+// Developed at SunSoft, a Sun Microsystems, Inc. business.
+// Permission to use, copy, modify, and distribute this
+// software is freely granted, provided that this notice
+// is preserved.
+// ====================================================
+//
+// The following is adapted from fdlibm (http://www.netlib.org/fdlibm).
+
+#ifndef V8_REMPIO2_H_
+#define V8_REMPIO2_H_
+
+namespace v8 {
+namespace internal {
+
+int rempio2(double x, double* y);
+
+// Constants to be exposed to builtins via Float64Array.
+struct TrigonometricConstants {
+  static const double constants[34];
+};
+}
+}  // namespace v8::internal
+
+#endif  // V8_REMPIO2_H_