8139484: [Findbugs] new sun.jvm.hotspot.SAGetopt(String[]) may expose internal representation

Clone array instead of just assign it

Reviewed-by: dholmes

hotspot/agent/src/share/classes/sun/jvm/hotspot/SAGetopt.java

@@ -37,7 +37,7 @@ public class SAGetopt {
     private boolean _optreset; // special handling of first call
 
     public SAGetopt(String[] args) {
-        _argv  = args;
+        _argv  = args.clone();
         _optind   = 0;
         _optopt   = 1;
         _optarg   = null;