Add a slow stub for store ICs.

src/ic.h

Index: src/ic.h
diff --git a/src/ic.h b/src/ic.h
index 435a5ce6f6be9fd7cd46659e6b0df85ff5348fb3..7e40131edf108aeee18fd9b3469f75ff54dce7fe 100644
--- a/src/ic.h
+++ b/src/ic.h
@@ -555,6 +555,14 @@ class StoreIC: public IC {
     }
   }
 
+  virtual Handle<Code> slow_stub() const {
+    if (strict_mode() == kStrictMode) {
+      return isolate()->builtins()->StoreIC_Slow_Strict();
+    } else {
+      return isolate()->builtins()->StoreIC_Slow();
+    }
+  }
+
   virtual Handle<Code> pre_monomorphic_stub() {
     return pre_monomorphic_stub(isolate(), strict_mode());
   }
@@ -677,6 +685,13 @@ class KeyedStoreIC: public StoreIC {
       return isolate->builtins()->KeyedStoreIC_PreMonomorphic();
     }
   }
+  virtual Handle<Code> slow_stub() const {
+    if (strict_mode() == kStrictMode) {
+      return isolate()->builtins()->KeyedStoreIC_Slow_Strict();
+    } else {
+      return isolate()->builtins()->KeyedStoreIC_Slow();
+    }
+  }
   virtual Handle<Code> megamorphic_stub() {
     if (strict_mode() == kStrictMode) {
       return isolate()->builtins()->KeyedStoreIC_Generic_Strict();