avoid false positives when looking for magic comments

avoid false positives when looking for magic comments

expect meta data only at the beginning of statements.

this required syntax fixes in some unrelated autotests.

Task-number: QTBUG-11866
Change-Id: Ic0c0c150ac8648df6953a510b8eb0c199c8d3ae2
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>