Add missing NOP, and B instruction forms.
Move ThumbFunc flag from section to symbol.
Make .w forms optional the other way around. If .w is explicitly put on an instruction the assembler should always chose a wide form.

git-svn-id: http://svn.freepascal.org/svn/fpc/branches/laksen@29341 3ad0048d-3df7-0310-abae-a5850022a9f2