Pretenure ASCII cons string in high promotion mode.

src/assembler.h

 // 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 739 matching lines @@
   static ExternalReference new_space_allocation_top_address(Isolate* isolate);
   static ExternalReference new_space_allocation_limit_address(Isolate* isolate);
   static ExternalReference old_pointer_space_allocation_top_address(
       Isolate* isolate);
   static ExternalReference old_pointer_space_allocation_limit_address(
       Isolate* isolate);
   static ExternalReference old_data_space_allocation_top_address(
       Isolate* isolate);
   static ExternalReference old_data_space_allocation_limit_address(
       Isolate* isolate);
+  static ExternalReference new_space_high_promotion_mode_active_address(
+      Isolate* isolate);
 
   static ExternalReference double_fp_operation(Token::Value operation,
                                                Isolate* isolate);
   static ExternalReference compare_doubles(Isolate* isolate);
   static ExternalReference power_double_double_function(Isolate* isolate);
   static ExternalReference power_double_int_function(Isolate* isolate);
 
   static ExternalReference handle_scope_next_address(Isolate* isolate);
   static ExternalReference handle_scope_limit_address(Isolate* isolate);
   static ExternalReference handle_scope_level_address(Isolate* isolate);
@@ skipping 261 matching lines @@
  public:
   NullCallWrapper() { }
   virtual ~NullCallWrapper() { }
   virtual void BeforeCall(int call_size) const { }
   virtual void AfterCall() const { }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ASSEMBLER_H_