[RFC] Slightly improved DWARF2 debug info for Fortran

[Paul Thomas]

Steven,

>I've only bootstrapped c,fortran with this patch, because I'm first
>looking for comments from people who know dwarf2out.c better than I do. 
>I know almost nothing about DWARF and even less about dwarf2out so I
>could really use a good review here ;-)
>
>  
>
Still less do I, so I can only applaud from the sidelines. Are you aware 
of http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24546?

If you can swat a few of those, it would be great!

Cheers

Paul