Hi,

This patch fixes incorrect Asan optimization in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106558 . It successfully
passes bootstrap-asan, regular bootstrap and regression testing (on
x86/amd64).

With this patch number of optimizations has reduced only slightly
(146062 -> 145824 on bootstrap-asan) so I decided to skip the more
complicated alias oracle-based approach that was suggested by Jakub in
the PR.

Best regards,
Yuri