[Bug target/87104] missed &, == optimization makes Emacs ~0.4% slower on x86-64

[pipcet at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87104

--- Comment #8 from pipcet at gmail dot com ---
Created attachment 44605
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44605&action=edit
patch to illustrate the issue