Call the RTL helpers for reference counted classes.

hlcgobj.pas, thlcgobj:
  * g_incrrefcount: call fpc_refcountclass_incr_ref for reference counted classes and pass along the offset to the hidden reference count field
  * g_finalize: call fpc_refcountclass_decr_ref for reference counted classes and pass along the offset to the hidden reference count field
ngenutil.pas, tnodeutils:
  * finalize_data_node: call fpc_refcountclass_decr_ref for reference counted classes and pass along the offset to the hidden reference count field
nld.pas, tassignmentnode:
  * pass_1: call fpc_refcountclass_assign if both sides of the assignment are reference counted classes and neither of them is declared as "weak"; also pass along the offset to the hidden reference count field


git-svn-id: http://svn.freepascal.org/svn/fpc/branches/svenbarth@28864 3ad0048d-3df7-0310-abae-a5850022a9f2