Reduce allocations in ParallelGC test.

Fixes GC stress test mode.

Bug: 16406852
Change-Id: I86c8fd7516c3f41075bca00c7d5b4dab2bb7b1d4
diff --git a/test/114-ParallelGC/src/Main.java b/test/114-ParallelGC/src/Main.java
index 01a3023..fb110bd 100644
--- a/test/114-ParallelGC/src/Main.java
+++ b/test/114-ParallelGC/src/Main.java
@@ -39,7 +39,7 @@
 
     public void run() {
         List l = new ArrayList();
-        for (int i = 0; i < 1000; i++) {
+        for (int i = 0; i < 500; i++) {
             l.add(new ArrayList(i));
         }
     }