[Bug c++/91445] After memset, logical && operator produces false result, optimization level >=O1

[frishy at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91445

--- Comment #1 from Ryan Frishberg <frishy at gmail dot com> ---
Created attachment 46708
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46708&action=edit
test1.cpp

Test case #1