Fix a heap lock/thread list lock deadlock.

We had an uncaught OOME whose uncaught exception handler -- running
with the thread lock held -- was trying to cause a GC while some
other thread had the heap lock and was waiting for the thread list
lock.

Change-Id: I22177129562268837127d9edcc63ef5e93054bdf
diff --git a/test/ParallelGC/ParallelGC.java b/test/ParallelGC/ParallelGC.java
index 13cb603..eb9e04e 100644
--- a/test/ParallelGC/ParallelGC.java
+++ b/test/ParallelGC/ParallelGC.java
@@ -41,9 +41,7 @@
         List l = new ArrayList();
         for (int i = 0; i < 1000; i++) {
             l.add(new ArrayList(i));
-            if (false) {
-                System.out.print(id);
-            }
+            System.out.print(id);
         }
     }
 }