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

src/assembler.cc

Index: src/assembler.cc
===================================================================
--- src/assembler.cc	(revision 7254)
+++ src/assembler.cc	(working copy)
@@ -67,6 +67,7 @@
 const double DoubleConstant::min_int = kMinInt;
 const double DoubleConstant::one_half = 0.5;
 const double DoubleConstant::minus_zero = -0.0;
+const double DoubleConstant::nan = OS::nan_value();
 const double DoubleConstant::negative_infinity = -V8_INFINITY;
 const char* RelocInfo::kFillerCommentString = "DEOPTIMIZATION PADDING";
 
@@ -757,6 +758,12 @@
 }
 
 
+ExternalReference ExternalReference::address_of_nan() {
+  return ExternalReference(reinterpret_cast<void*>(
+      const_cast<double*>(&DoubleConstant::nan)));
+}
+
+
 #ifndef V8_INTERPRETED_REGEXP
 
 ExternalReference ExternalReference::re_check_stack_guard_state() {