[Bug c/123960] Incorrect pointer address calculation on x64.

[sz.tarnowski at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123960

--- Comment #3 from Szymon Tarnowski <sz.tarnowski at gmail dot com> ---
Alternative reproduction where ptr does not be initilized:

ptr = memory + -((unsigned int)*memory)