+ added overloads to tai_const.Createname and Create_type_name, which take a Tasmsymtype parameter; to be used for declaring external symbols which reside in the data segment with AT_DATA, which is necessary for i8086 medium and compact memory models (where code and data pointers are of different size)

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25243 3ad0048d-3df7-0310-abae-a5850022a9f2