--- old/src/java.base/share/classes/java/lang/invoke/MethodHandle.java	2015-01-21 19:20:02.000000000 +0300
+++ new/src/java.base/share/classes/java/lang/invoke/MethodHandle.java	2015-01-21 19:20:02.000000000 +0300
@@ -434,6 +434,8 @@
     // form is not private so that invokers can easily fetch it
     /*private*/ MethodHandle asTypeCache;
     // asTypeCache is not private so that invokers can easily fetch it
+    /*non-public*/ byte customizationCount;
+    // customizationCount should be accessible from invokers
 
     /**
      * Reports the type of this method handle.
@@ -1431,6 +1433,17 @@
         UNSAFE.fullFence();
     }
 
+    /** Craft a LambdaForm customized for this particular MethodHandle */
+    /*non-public*/
+    void customize() {
+        if (form.customized == null) {
+            LambdaForm newForm = new LambdaForm(form.debugName, form.arity, form.names, form.result, form.forceInline, this);
+            updateForm(newForm);
+        } else {
+            assert(form.customized == this);
+        }
+    }
+
     private static final long FORM_OFFSET;
     static {
         try {