* Calling tlabelsym.mangledname should not define the label. This was causing "already defined" errors if a label was referenced before it was defined.
+ Test.
+ Check duplicate labels in assembler blocks. This was impossible due to above bug and duplicate labels were detected only at assembling stage where no location information could be provided.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@27472 3ad0048d-3df7-0310-abae-a5850022a9f2