ServiceUtil::visible_oop is not needed anymore

This is the code after the OopStorage patch:
http://cr.openjdk.java.net/~kbarrett/8194312/open.00/src/hotspot/share/services/serviceUtil.hpp.frames.html

  36 class ServiceUtil : public AllStatic {
  37 public:
  38
  39 // Return true if oop represents an object that is "visible"
  40 // to the java world.
  41 static inline bool visible_oop(oop o) {
  42 // instance
  43 if (o->is_instance()) {
  44 // instance objects are visible
  45 if (o->klass() != SystemDictionary::Class_klass()) {
  46 return true;
  47 }
  48 if (java_lang_Class::is_primitive(o)) {
  49 return true;
  50 }
  51 // java.lang.Classes are visible
  52 Klass* k = java_lang_Class::as_Klass(o);
  53 if (k->is_klass()) {
  54 // if it's a class for an object, an object array, or
  55 // primitive (type) array then it's visible.
  56 if (k->is_instance_klass()) {
  57 return true;
  58 }
  59 if (k->is_objArray_klass()) {
  60 return true;
  61 }
  62 if (k->is_typeArray_klass()) {
  63 return true;
  64 }
  65 }
  66 return false;
  67 }
  68 // object arrays are visible if they aren't system object arrays
  69 if (o->is_objArray()) {
  70 return true;
  71 }
  72 // type arrays are visible
  73 if (o->is_typeArray()) {
  74 return true;
  75 }
  76 // everything else (Method*s, ...) aren't visible
  77 return false;
  78 }; // end of visible_oop()
  79
  80 };

Neither of the two return false statements are reachable, so this function could be removed.