* a_call_ref functionality cannot be implemented efficiently at code generator level, because references need specific preparations at earlier points. Moved this support to tcgcallnode and its x86 descendants, and got rid of all ifdef's around.
+ x86 targets now directly call procedure variables located in references.
- a_call_ref method removed from tcg and thlcgobj.


git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@26666 3ad0048d-3df7-0310-abae-a5850022a9f2