Merge bleeding edge up to 8774 into the GC branch.

src/assembler.h

Index: src/assembler.h
===================================================================
--- src/assembler.h	(revision 8778)
+++ src/assembler.h	(working copy)
@@ -70,7 +70,8 @@
   static const double zero;
   static const double uint8_max_value;
   static const double negative_infinity;
-  static const double nan;
+  static const double canonical_non_hole_nan;
+  static const double the_hole_nan;
 };
 
 
@@ -642,7 +643,8 @@
   static ExternalReference address_of_zero();
   static ExternalReference address_of_uint8_max_value();
   static ExternalReference address_of_negative_infinity();
-  static ExternalReference address_of_nan();
+  static ExternalReference address_of_canonical_non_hole_nan();
+  static ExternalReference address_of_the_hole_nan();
 
   static ExternalReference math_sin_double_function(Isolate* isolate);
   static ExternalReference math_cos_double_function(Isolate* isolate);