[tree-ssa] Loop header copying on trees

[Zdenek Dvorak]

Hello,

> Overall it looks pretty good to me.  I think once you made the edits 
> Diego and I have requested, another bootstrap/test cycle and you should
> install the patch (ie, I don't think it needs another review cycle unless
> you end up making some unexpected major changes).

done.  I would also like to include the recent patch from lno-branch
(http://gcc.gnu.org/ml/gcc-patches/2004-02/msg01739.html) that prevents
the pass from peeling the do-while style loops (possibly created by jump
threading).  Ok?

Zdenek