Change VG_(get_filename_linenum) to return filename and directory
name in static buffers. Fix call sites.


git-svn-id: svn://svn.valgrind.org/valgrind/branches/BUF_REMOVAL@14293 a5019735-40e9-0310-863c-91ae7b9d1cf9
Remove VG_(strncpy_safely). It is no longer needed.


git-svn-id: svn://svn.valgrind.org/valgrind/branches/BUF_REMOVAL@14294 a5019735-40e9-0310-863c-91ae7b9d1cf9