Add some debugging code to diagnose 602-deoptimizeable failures.

Test: 602-deoptimizeable
bug: 115849764
Change-Id: Ie331bb335c490333104ffe2b563234d07e25def4
diff --git a/test/602-deoptimizeable/src/Main.java b/test/602-deoptimizeable/src/Main.java
index d995923..3d45b86 100644
--- a/test/602-deoptimizeable/src/Main.java
+++ b/test/602-deoptimizeable/src/Main.java
@@ -126,6 +126,9 @@
                     assertIsManaged();
                     map.put(new DummyObject(10), Long.valueOf(100));
                     assertIsInterpreted();  // Every deoptimizeable method is deoptimized.
+                    if (map.get(new DummyObject(10)) == null) {
+                        System.out.println("Expected map to contain DummyObject(10)");
+                    }
                 } catch (Exception e) {
                     e.printStackTrace(System.out);
                 }