Disable trying to merge compatible shapes since it may be too costly.

Author: woess

graal-js/src/com.oracle.truffle.js/src/com/oracle/truffle/js/runtime/JSConfig.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2020, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * The Universal Permissive License (UPL), Version 1.0
@@ -91,7 +91,7 @@ public final class JSConfig {
     /** Migrate objects to dictionary mode when the number of properties exceeds this threshold. */
     public static final int DictionaryObjectThreshold = 256;
     public static final int DictionaryObjectTransitionThreshold = 1024;
-    public static final boolean MergeShapes = true;
+    public static boolean MergeShapes = false;
     // GR-31859
     public static boolean MergeCompatibleLocations = true;