Don't wrap roots in Handle just to dereference immediately.

src/regexp/jsregexp.cc

Index: src/regexp/jsregexp.cc
diff --git a/src/regexp/jsregexp.cc b/src/regexp/jsregexp.cc
index ef4a61a520e7003cd14af5d13c86461855870a67..f0abc9a8b335437c4c607a8ef8fe16b48eb901a6 100644
--- a/src/regexp/jsregexp.cc
+++ b/src/regexp/jsregexp.cc
@@ -6866,7 +6866,7 @@ void RegExpResultsCache::Enter(Isolate* isolate, Handle<String> key_string,
     }
   }
   // Convert backing store to a copy-on-write array.
-  value_array->set_map_no_write_barrier(*factory->fixed_cow_array_map());
+  value_array->set_map_no_write_barrier(isolate->heap()->fixed_cow_array_map());
 }