[tree-ssa-cfg] Bugfixes

[Zdenek Dvorak]

Hello,

>  >this patch fixes several problems with line numbers reported in
>  >error messages, and a stupid bug in loop gimplification causing
>  >misscompilation of libjava.
> Err, shouldn't this be submitted for inclusion into the main tree-ssa
> branch now?  I don't see a reason why this stuff should be going on a
> sub-branch.

these are all branch-specific issues.

Zdenek