Avoid one repeated property lookup when computing load ICs.

src/objects.h

 // Copyright 2012 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.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include "src/allocation.h"
 #include "src/assert-scope.h"
 #include "src/builtins.h"
@@ skipping 7862 matching lines @@
   DECL_ACCESSORS(native_context, Context)
 
   // [global context]: the most recent (i.e. innermost) global context.
   DECL_ACCESSORS(global_context, Context)
 
   // [global proxy]: the global proxy object of the context
   DECL_ACCESSORS(global_proxy, JSObject)
 
   // Retrieve the property cell used to store a property.
   PropertyCell* GetPropertyCell(LookupResult* result);
+  PropertyCell* GetPropertyCell(LookupIterator* lookup);
 
   DECLARE_CAST(GlobalObject)
 
   // Layout description.
   static const int kBuiltinsOffset = JSObject::kHeaderSize;
   static const int kNativeContextOffset = kBuiltinsOffset + kPointerSize;
   static const int kGlobalContextOffset = kNativeContextOffset + kPointerSize;
   static const int kGlobalProxyOffset = kGlobalContextOffset + kPointerSize;
   static const int kHeaderSize = kGlobalProxyOffset + kPointerSize;
 
@@ skipping 3318 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_