[runtime] Avoid @@isConcatSpreadable lookup for fast path Array.prototype.concat

src/isolate-inl.h

Index: src/isolate-inl.h
diff --git a/src/isolate-inl.h b/src/isolate-inl.h
index 58a169bd9daa137a5a435becee3c5516489ce8ab..48e3f56b67e771c02d96784ccda5a392073780cd 100644
--- a/src/isolate-inl.h
+++ b/src/isolate-inl.h
@@ -115,7 +115,7 @@ bool Isolate::IsArraySpeciesLookupChainIntact() {
   // done here. In place, there are mjsunit tests harmony/array-species* which
   // ensure that behavior is correct in various invalid protector cases.
 
-  PropertyCell* species_cell = heap()->species_protector();
+  Cell* species_cell = heap()->species_protector();
   return species_cell->value()->IsSmi() &&
          Smi::cast(species_cell->value())->value() == kArrayProtectorValid;
 }