6829021: tests for 6636138 use UseSuperword instead of UseSuperWord

Summary: Remove the wrong flag -XX:+UseSuperword to fix the Nightly failure
Reviewed-by: kvn, never

hotspot/test/compiler/6636138/Test1.java

@@ -26,7 +26,7 @@
  * @bug 6636138
  * @summary SuperWord::co_locate_pack(Node_List* p) generates memory graph that leads to memory order violation.
  *
- * @run main/othervm -server -Xbatch -XX:CompileOnly=Test1.init -XX:+UseSuperword Test1
+ * @run main/othervm -server -Xbatch -XX:CompileOnly=Test1.init Test1
  */
 
 class Test1 {

hotspot/test/compiler/6636138/Test2.java

@@ -26,7 +26,7 @@
  * @bug 6636138
  * @summary SuperWord::co_locate_pack(Node_List* p) generates memory graph that leads to memory order violation.
  *
- * @run main/othervm -server -Xbatch -XX:CompileOnly=Test2.shift -XX:+UseSuperword Test2
+ * @run main/othervm -server -Xbatch -XX:CompileOnly=Test2.shift Test2
  */
 
 class Test2 {