[Bug c++/93940] crazy codegen bug on Og with builtin_constant_p, coverage, and pthread

[barry.revzin at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93940

--- Comment #1 from Barry Revzin <barry.revzin at gmail dot com> ---
gcc 7.x has the same behavior. gcc 6.x work fine.