[Bug c/65752] Too strong optimizations int -> pointer casts

[gcc at robbertkrebbers dot nl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65752

--- Comment #9 from Robbert <gcc at robbertkrebbers dot nl> ---
(In reply to Richard Biener from comment #6)
> which fixes the testcase (but is incomplete - equivalences built on
> gimple assignment RHS need to be considered as well).
Can you give an example?