[PATCH]: Clear SSA_NAME_DEF_STMT on released SSA names

[Daniel Berlin]

On 9/29/06, Daniel Berlin <dberlin@dberlin.org> wrote:
> > Bad idea unless something has changed.
> >
> > SSA_NAME_DEF_STMT uses the tree chain field.  WHen we release an
> > SSA_NAME we use the chain field to link together all the free SSA_NAME
> > nodes.
>
> Interesting. It survived bootstrap and regtesting here.
> It must be reset later on again to chain them together.
Ah, so it is, about 30 lines down.

Except we reference it as just TREE_CHAIN.
Forget it then, i'll wait till we have SSA_NAME's where we aren't
sharing things like this.