[fortran,patch] Fix PR 33739, emitting calls to debug_hooks->end_source_file

[Paul Richard Thomas]

FX,

:REVIEWMAIL:

> Regtested on x86_64-linux with dwarf and stabs, and regtested on powerpc-apple-darwin8 (stabs) with -m32 and -m64. OK to commit?

OK to commit

Thanks

Paul