Fix ObjectStreamClassCaching (openjdk#6)

Author: xmas92

test/jdk/java/io/ObjectStreamClass/ObjectStreamClassCaching.java

@@ -54,7 +54,7 @@
  * @bug 8277072
  * @library /test/lib/
  * @summary ObjectStreamClass caches keep ClassLoaders alive (Z GC)
- * @run testng/othervm -Xmx64m -XX:+UseZGC ObjectStreamClassCaching
+ * @run testng/othervm -Xmx128m -XX:+UseZGC ObjectStreamClassCaching
  */
 
 /*