make IndexReader.getRefCount() expert and public

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@751241 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/lucene/index/IndexReader.java

@@ -113,9 +113,9 @@ public abstract class IndexReader implements Cloneable {
   protected boolean hasChanges;
   
   private volatile int refCount;
-  
-  // for testing
-  synchronized int getRefCount() {
+
+  /** Expert: returns the current refCount for this reader */
+  public synchronized int getRefCount() {
     return refCount;
   }