Implemented a ContextSlotCache for compiled code.

src/runtime.cc

 // Copyright 2006-2009 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 106 matching lines @@
     for (int i = 0; i < properties->length(); i++) {
       Object* value = properties->get(i);
       if (value->IsJSObject()) {
         JSObject* jsObject = JSObject::cast(value);
         result = DeepCopyBoilerplate(jsObject);
         if (result->IsFailure()) return result;
         properties->set(i, result, mode);
       }
     }
     mode = copy->GetWriteBarrierMode();
-    for (int i = 0; i < copy->map()->inobject_properties(); i++) {
+    int nof = copy->map()->inobject_properties();
+    for (int i = 0; i < nof; i++) {
       Object* value = copy->InObjectPropertyAt(i);
       if (value->IsJSObject()) {
         JSObject* jsObject = JSObject::cast(value);
         result = DeepCopyBoilerplate(jsObject);
         if (result->IsFailure()) return result;
         copy->InObjectPropertyAtPut(i, result, mode);
       }
     }
   } else {
     result = Heap::AllocateFixedArray(copy->NumberOfLocalProperties(NONE));
@@ skipping 7379 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     Counters::gc_last_resort_from_js.Increment();
     Heap::CollectAllGarbage();
   }
 }
 
 
 } }  // namespace v8::internal