Remove deprecated v8::base::OS::nan_value().

src/assembler.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 1445 matching lines @@
     int y_int = static_cast<int>(y);
     if (y == y_int) {
       return std::ldexp(1.0, y_int);
     }
   }
 #endif
 
   // The checks for special cases can be dropped in ia32 because it has already
   // been done in generated code before bailing out here.
   if (std::isnan(y) || ((x == 1 || x == -1) && std::isinf(y))) {
-    return base::OS::nan_value();
+    return std::numeric_limits<double>::quiet_NaN();
   }
   return std::pow(x, y);
 }
 
 
 ExternalReference ExternalReference::power_double_double_function(
     Isolate* isolate) {
   return ExternalReference(Redirect(isolate,
                                     FUNCTION_ADDR(power_double_double),
                                     BUILTIN_FP_FP_CALL));
@@ skipping 111 matching lines @@
     assembler_->RecordRelocInfo(RelocInfo::POSITION, state_.current_position);
     state_.written_position = state_.current_position;
     written = true;
   }
 
   // Return whether something was written.
   return written;
 }
 
 } }  // namespace v8::internal