[Bug middle-end/84747] alias analysis reports may-conflict for references to disjoint address spaces

[stefan at reservoir dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84747

--- Comment #3 from Stefan M Freudenberger <stefan at reservoir dot com> ---
In this case I would have expected that TARGET_ADDR_SPACE_SUBSET_P will return
TRUE, as appropriate.

Granted, it would render my example invalid for x86.