Incorrect bitfield aliasing with Tree SSA

[Adam Nemet]

Richard Kenner writes:
> But there's also an implementation issue: where do you propose to *store*
> this fake alias set?  There is no such field as DECL_ALIAS_SET.

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.

Adam