[Bug tree-optimization/67955] tree-dse does not use pointer info

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67955

--- Comment #6 from vries at gcc dot gnu.org ---
(In reply to vries from comment #4)
> For now, I'll do a bootstrap and reg-test to make sure it doesn't break
> anything.

Updated tentative patch passes bootstrap and reg-test