[Isolates] Merge 7201:7258 from bleeding_edge to isolates.

src/assembler.h

Index: src/assembler.h
===================================================================
--- src/assembler.h	(revision 7254)
+++ src/assembler.h	(working copy)
@@ -52,6 +52,7 @@
   static const double one_half;
   static const double minus_zero;
   static const double negative_infinity;
+  static const double nan;
 };
 
 
@@ -592,6 +593,7 @@
   static ExternalReference address_of_one_half();
   static ExternalReference address_of_minus_zero();
   static ExternalReference address_of_negative_infinity();
+  static ExternalReference address_of_nan();
 
   static ExternalReference math_sin_double_function();
   static ExternalReference math_cos_double_function();