8122944: perfdata used is seen as too high on sparc zone with jdk1.9 and causes a test failure

Reviewed-by: dholmes
diff --git a/jdk/test/sun/jvmstat/perfdata/PrologSanity/PrologSizeSanityCheck.java b/jdk/test/sun/jvmstat/perfdata/PrologSanity/PrologSizeSanityCheck.java
index 7908996..0fd5cce 100644
--- a/jdk/test/sun/jvmstat/perfdata/PrologSanity/PrologSizeSanityCheck.java
+++ b/jdk/test/sun/jvmstat/perfdata/PrologSanity/PrologSizeSanityCheck.java
@@ -25,7 +25,7 @@
  * @test
  * @bug 4990825
  * @modules jdk.jvmstat/sun.jvmstat.monitor
- * @run main/othervm -XX:+UsePerfData  PrologSizeSanityCheck
+ * @run main/othervm -XX:+UsePerfData -XX:PerfDataMemorySize=64k PrologSizeSanityCheck
  * @summary prolog size and overflow sanity checks
  */