ES6 symbols: Allow symbols as property names

src/ia32/macro-assembler-ia32.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 403 matching lines @@
 
   // Check if the object in register heap_object is a string. Afterwards the
   // register map contains the object map and the register instance_type
   // contains the instance_type. The registers map and instance_type can be the
   // same in which case it contains the instance type afterwards. Either of the
   // registers map and instance_type can be the same as heap_object.
   Condition IsObjectStringType(Register heap_object,
                                Register map,
                                Register instance_type);
 
+  // Check if the object in register heap_object is a name. Afterwards the
+  // register map contains the object map and the register instance_type
+  // contains the instance_type. The registers map and instance_type can be the
+  // same in which case it contains the instance type afterwards. Either of the
+  // registers map and instance_type can be the same as heap_object.
+  Condition IsObjectNameType(Register heap_object,
+                             Register map,
+                             Register instance_type);
+
   // Check if a heap object's type is in the JSObject range, not including
   // JSFunction.  The object's map will be loaded in the map register.
   // Any or all of the three registers may be the same.
   // The contents of the scratch register will always be overwritten.
   void IsObjectJSObjectType(Register heap_object,
                             Register map,
                             Register scratch,
                             Label* fail);
 
   // The contents of the scratch register will be overwritten.
@@ skipping 70 matching lines @@
 
   // Abort execution if argument is not a smi, enabled via --debug-code.
   void AssertSmi(Register object);
 
   // Abort execution if argument is a smi, enabled via --debug-code.
   void AssertNotSmi(Register object);
 
   // Abort execution if argument is not a string, enabled via --debug-code.
   void AssertString(Register object);
 
+  // Abort execution if argument is not a name, enabled via --debug-code.
+  void AssertName(Register object);
+
   // ---------------------------------------------------------------------------
   // Exception handling
 
   // Push a new try handler and link it into try handler chain.
   void PushTryHandler(StackHandler::Kind kind, int handler_index);
 
   // Unlink the stack handler on top of the stack from the try handler chain.
   void PopTryHandler();
 
   // Throw to the top handler in the try hander chain.
@@ skipping 480 matching lines @@
   }                                                                       \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_MACRO_ASSEMBLER_IA32_H_