* stabn writing code simplified
* write 0 instead of "label-label" in stabn, arm thumb assemblers do not like "label-label", for other targets writing 0 should make no difference

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@28539 3ad0048d-3df7-0310-abae-a5850022a9f2