The check for internalized strings relied on the fact that we had less

src/arm/macro-assembler-arm.h

 // Copyright 2012 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1278 matching lines @@
       Register scratch1,
       Register scratch2,
       Label* failure);
 
   // Check if instance type is sequential ASCII string and jump to label if
   // it is not.
   void JumpIfInstanceTypeIsNotSequentialAscii(Register type,
                                               Register scratch,
                                               Label* failure);
 
+  void JumpIfNotUniqueName(Register reg, Label* not_unique_name);
 
   // ---------------------------------------------------------------------------
   // Patching helpers.
 
   // Get the location of a relocated constant (its address in the constant pool)
   // from its load site.
   void GetRelocatedValueLocation(Register ldr_location,
                                  Register result);
 
 
@@ skipping 140 matching lines @@
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_MACRO_ASSEMBLER_ARM_H_