Delete some dead code in NameValueTableWrapper and SharedMap

hphp/runtime/base/shared/shared_map.cpp

@@ -84,11 +84,6 @@ bool SharedMap::exists(const StringData* k) const {
 
 bool SharedMap::exists(int64_t k) const {
   return getIndex(k) != -1;
-  if (isVector()) {
-    if (k < 0 || (size_t)k >= m_vec->m_size) return false;
-    return true;
-  }
-  return m_map->indexOf(k) != -1;
 }
 
 /* if a2 is modified copy of a1 (i.e. != a1), then release a1 and return a2 */

hphp/runtime/vm/name_value_table_wrapper.cpp

@@ -67,10 +67,6 @@ bool NameValueTableWrapper::exists(const StringData* k) const {
   return m_tab->lookup(k);
 }
 
-bool NameValueTableWrapper::idxExists(ssize_t idx) const {
-  return false;
-}
-
 TypedValue* NameValueTableWrapper::nvGet(const StringData* k) const {
   return m_tab->lookup(k);
 }

hphp/runtime/vm/name_value_table_wrapper.h

@@ -83,7 +83,6 @@ public: // ArrayData implementation
 
   virtual bool exists(int64_t k) const;
   virtual bool exists(const StringData* k) const;
-  virtual bool idxExists(ssize_t idx) const;
 
   virtual TypedValue* nvGet(int64_t k) const;
   virtual TypedValue* nvGet(const StringData* k) const;