Merging stmt_ann_d into tree_statement_list_node

[Zdenek Dvorak]

Hello,

> > o One step closer to a flat statement structure (or a tuple form if
> >   you like).  It's a bit silly that we have GIMPLE, but we still do
> >   not have a flat structure.

on a side note, I am currently working on cleaning up gimplification
(mostly to enable embedding of simple and fast cleanup passes like local
value numbering, copy/constant propagation and unreachable code
removal).  As a side effect, this will cause gimplifier to directly
produce gimple statements instead of gradually rewriting the function
tree.  I will tell more about this project on GCC summit.

Once this is done, I would like to start working on moving gimple out of
trees to the "flat" structure.

Zdenek