Introduce a handle zapping setting, and enable it by default for release and debug

src/handles-inl.h

Index: src/handles-inl.h
diff --git a/src/handles-inl.h b/src/handles-inl.h
index 4f4490b75bfa97d2c0aa0d0e03b3833f3a19c8fb..f427d1287eb90e7dff0f6d805083409ffa4f0700 100644
--- a/src/handles-inl.h
+++ b/src/handles-inl.h
@@ -134,7 +134,7 @@ void HandleScope::CloseScope(Isolate* isolate,
     DeleteExtensions(isolate);
   }
 
-#ifdef ENABLE_EXTRA_CHECKS
+#ifdef ENABLE_HANDLE_ZAPPING
   ZapRange(prev_next, prev_limit);
 #endif
 }