Revert "GVN fix, preventing loads hoisting above stores to the same field when HObjectAccess's repr…

src/hydrogen-gvn.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/hydrogen.h"
 #include "src/hydrogen-gvn.h"
 #include "src/v8.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 448 matching lines @@
     global_vars_[num_global_vars_++] = cell;
     return true;
   }
   return false;
 }
 
 
 bool SideEffectsTracker::ComputeInobjectField(HObjectAccess access,
                                               int* index) {
   for (int i = 0; i < num_inobject_fields_; ++i) {
-    if (access.SameField(inobject_fields_[i])) {
+    if (access.Equals(inobject_fields_[i])) {
       *index = i;
       return true;
     }
   }
   if (num_inobject_fields_ < kNumberOfInobjectFields) {
     if (FLAG_trace_gvn) {
       HeapStringAllocator allocator;
       StringStream stream(&allocator);
       stream.Add("Tracking inobject field access ");
       access.PrintTo(&stream);
@@ skipping 424 matching lines @@
                                                       dominated);
         successor_map->Kill(side_effects_on_all_paths);
         successor_dominators->Kill(side_effects_on_all_paths);
       }
     }
     current = next;
   }
 }
 
 } }  // namespace v8::internal