6730587: TEST: com/sun/jdi/MonitorFrameInfoTest.java fails with -server -Xcomp

Summary: Fix test to prevent C2 escape analysis from deleting the required synchronized blocks
Reviewed-by: swamyv

test/com/sun/jdi/MonitorFrameInfo.java

@@ -49,6 +49,7 @@ class MonitorTestTarg {
     static void foo2() {
         Object l1 = new Object();
         synchronized(l1) {
+            System.out.println("executing foo2 " + l1);
             foo3();
         }
     }
@@ -59,6 +60,7 @@ class MonitorTestTarg {
         System.out.println("Howdy!");
         Object l1 = new Object();
         synchronized(l1) {
+            System.out.println("executing main" + l1);
             foo1();
         }
     }