- removed obsolete and commented out variable

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@29320 3ad0048d-3df7-0310-abae-a5850022a9f2
+ Comment about behavior of DBRA instruction


git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@29321 3ad0048d-3df7-0310-abae-a5850022a9f2