7054512: Compress class pointers after perm gen removal

Support of compress class pointers in the compilers.

Reviewed-by: kvn, twisti

hotspot/src/share/vm/runtime/stubRoutines.cpp

@@ -421,6 +421,7 @@ address StubRoutines::select_fill_function(BasicType t, bool aligned, const char
   case T_ARRAY:
   case T_OBJECT:
   case T_NARROWOOP:
+  case T_NARROWKLASS:
   case T_ADDRESS:
     // Currently unsupported
     return NULL;