Split off do_int_from_hlt() from do_int(). It simplifies some processing
since we don't need to check cs:ip again, and allows simplification of
run_caller_func().


git-svn-id: https://dosemu.svn.sourceforge.net/svnroot/dosemu/trunk@1324 7758b857-130e-0410-ab9c-d8735a528d18