Reland 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 b9ee070ccf69ec25b1805a0c14d656aae0a57e71..035b4b363c2c0c021d9f789215ada2b79e436955 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -1024,6 +1024,10 @@ class Isolate {
 
   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();
 
   // Given an address occupied by a live code object, return that object.
@@ -1299,6 +1303,8 @@ class Isolate {
   // 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