Revert of VectorICs: ia32 store ics need a virtual register.

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 035b4b363c2c0c021d9f789215ada2b79e436955..b9ee070ccf69ec25b1805a0c14d656aae0a57e71 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -1023,10 +1023,6 @@
   }
 
   void* stress_deopt_count_address() { return &stress_deopt_count_; }
-
-  void* vector_store_virtual_register_address() {
-    return &vector_store_virtual_register_;
-  }
 
   base::RandomNumberGenerator* random_number_generator();
 
@@ -1303,8 +1299,6 @@
   // Counts deopt points if deopt_every_n_times is enabled.
   unsigned int stress_deopt_count_;
 
-  Address vector_store_virtual_register_;
-
   int next_optimization_id_;
 
 #if TRACE_MAPS