Introduce HObjectAccess, which is used by LoadNamedField and StoreNamedField to denote what parts

test/mjsunit/regress/regress-123919.js

 // 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 20 matching lines @@
   this.x = 0;
   for (var i = 0; i < max; i++) {
     this.x = i/100;
   }
   this.val = val;
 }
 
 function f(max) {
   var val = 0.5;
   var obj = new g(max,val);
+  %DebugPrint(obj);
+  %DebugPrint(obj.val);
   assertSame(val, obj.val);
 }
 
 f(1);
 f(1);
 %OptimizeFunctionOnNextCall(f);
 f(200000);