In addReference, remove calling tostring on the references being added.

The tostring can be a very expensive operation, and causes
massive slowdown when used in conjuction with antcall.


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@275769 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/Project.java

@@ -1747,17 +1747,7 @@ public class Project {
                 log("Overriding previous definition of reference to " + name,
                     MSG_WARN);
             }
-
-            String valueAsString = "";
-            try {
-                valueAsString = value.toString();
-            } catch (Throwable t) {
-                log("Caught exception (" + t.getClass().getName() + ")"
-                    + " while expanding " + name + ": " + t.getMessage(),
-                    MSG_WARN);
-            }
-            log("Adding reference: " + name + " -> " + valueAsString,
-                MSG_DEBUG);
+            log("Adding reference: " + name, MSG_DEBUG);
             references.put(name, value);
         }
     }