Incorrect bitfield aliasing with Tree SSA

[Adam Nemet]

Richard Kenner writes:
> > I am glad to see we are converging toward implementation issues now!
> > 
> > I am storing it in a new field under the alias_set_entry:
> > 
> >   get_alias_set_entry (TYPE_ALIAS_SET (t))->nonaddr_alias_set.
> 
> Where T is which type? 

Type of the expression passed to get_alias_set.  And without the
component_uses_parent_alias_set loop.

Adam