TagCache: Make EntryVal class public

Change-Id: Ie6d0df1ce60d55f8904df63562e800d9738e3ae1

java/com/google/gerrit/server/git/TagCache.java

diff --git a/java/com/google/gerrit/server/git/TagCache.java b/java/com/google/gerrit/server/git/TagCache.java
index d346997..b8acd0a 100644
--- a/java/com/google/gerrit/server/git/TagCache.java
+++ b/java/com/google/gerrit/server/git/TagCache.java
@@ -103,7 +103,7 @@
     cache.put(name.get(), val);
   }
 
-  static class EntryVal implements Serializable {
+  public static class EntryVal implements Serializable {
     static final long serialVersionUID = 1L;
 
     transient TagSetHolder holder;