Remove some extraneous includes and a function, all added in bug 714260. They...

Remove some extraneous includes and a function, all added in bug 714260.  They were initially necessary when that patch was written, but they became vestigial during rebasing prior to landing, and this disuse wasn't noticed til now.  r=lumpy

js/src/jsval.h

@@ -12,8 +12,6 @@
  * Implementation details for js::Value in jsapi.h.
  */
 
-#include "mozilla/FloatingPoint.h"
-
 #include "js/Utility.h"
 
 JS_BEGIN_EXTERN_C

mfbt/FloatingPoint.h

@@ -226,16 +226,6 @@ MOZ_DOUBLE_MIN_VALUE()
   return pun.d;
 }
 
-/** Computes a 32-bit hash of the given double. */
-static MOZ_ALWAYS_INLINE uint32_t
-MOZ_HASH_DOUBLE(double d)
-{
-  union MozDoublePun pun;
-  pun.d = d;
-
-  return ((uint32_t)(pun.u >> 32)) ^ ((uint32_t)(pun.u));
-}
-
 static MOZ_ALWAYS_INLINE int
 MOZ_DOUBLE_IS_INT32(double d, int32_t* i)
 {