7186278: Build error after CR#6995781 / 7151532 with GCC 4.7.0

Summary: Templates need this object if not using template parameter in call
Reviewed-by: coleenp, kamg, dholmes

src/share/vm/utilities/hashtable.cpp

@@ -135,7 +135,7 @@ template <class T, MEMFLAGS F> void Hashtable<T, F>::move_to(Hashtable<T, F>* ne
       // walking the hashtable past these entries requires
       // BasicHashtableEntry::make_ptr() call.
       bool keep_shared = p->is_shared();
-      unlink_entry(p);
+      this->unlink_entry(p);
       new_table->add_entry(index, p);
       if (keep_shared) {
         p->set_shared();

src/share/vm/utilities/hashtable.hpp

@@ -260,7 +260,7 @@ protected:
   }
 
   int index_for(Symbol* name) {
-    return hash_to_index(compute_hash(name));
+    return this->hash_to_index(compute_hash(name));
   }
 
   // Table entry management