chakrashim: remove stale ref objectInstance and save 8bytes

PR-URL: #432

Reviewed-By: Kyle Farnung <kfarnung@microsoft.com>
Reviewed-By: Jimmy Thomson <jithomson@microsoft.com>

Author: obastemur

deps/chakrashim/src/v8chakra.h

@@ -161,7 +161,6 @@ class ObjectData: public ExternalData {
     bool isRefValue;
   };
 
-  JsValueRef objectInstance;
   Persistent<ObjectTemplate> objectTemplate;  // Original ObjectTemplate
   SetterGetterInterceptor * setterGetterInterceptor;
   int internalFieldCount;

deps/chakrashim/src/v8objecttemplate.cc

@@ -947,7 +947,6 @@ Local<Object> ObjectTemplate::NewInstance(Handle<Object> prototype) {
     return Local<Object>();
   }
 
-  objectData->objectInstance = newInstanceRef;
   return Local<Object>::New(static_cast<Object*>(newInstanceRef));
 }