[jvm] Remove dead code

All of those methods have been replaced with a version that
honors ThreadContext.

Author: usev6

src/vm/jvm/runtime/org/perl6/nqp/runtime/Ops.java

@@ -2445,13 +2445,6 @@ public static SixModelObject multicachefind(SixModelObject cache, SixModelObject
             return null;
     }
 
-    public static long where(SixModelObject o) {
-        return o.hashCode();
-    }
-    public static SixModelObject setwho(SixModelObject o, SixModelObject who) {
-        o.st.WHO = who;
-        return o;
-    }
     public static SixModelObject what(SixModelObject o, ThreadContext tc) {
         return decont(o, tc).st.WHAT;
     }
@@ -2584,9 +2577,6 @@ public static long isnull(SixModelObject obj) {
     public static long isnull_s(String str) {
         return str == null ? 1 : 0;
     }
-    public static String reprname(SixModelObject obj) {
-        return obj.st.REPR.name;
-    }
     public static String reprname(SixModelObject obj, ThreadContext tc) {
         return decont(obj, tc).st.REPR.name;
     }