BL/BLX in thumb mode is a long composed instruction in Thumb as well as Thumb2

git-svn-id: http://svn.freepascal.org/svn/fpc/branches/laksen@29333 3ad0048d-3df7-0310-abae-a5850022a9f2
Change .thumb_func to be an ait_directive instead of it's own tai type.

git-svn-id: http://svn.freepascal.org/svn/fpc/branches/laksen@29334 3ad0048d-3df7-0310-abae-a5850022a9f2