Add untagged double versions of Math.sin and Math.cos.

src/heap.h

Index: src/heap.h
===================================================================
--- src/heap.h	(revision 6082)
+++ src/heap.h	(working copy)
@@ -1968,6 +1968,8 @@
 class TranscendentalCache {
  public:
   enum Type {ACOS, ASIN, ATAN, COS, EXP, LOG, SIN, TAN, kNumberOfCaches};
+  static const int kTranscendentalTypeBits = 3;
+  STATIC_ASSERT((1 << kTranscendentalTypeBits) >= kNumberOfCaches);
 
   explicit TranscendentalCache(Type t);