[Bug target/122018] x86 doesn't use BTS bitmanip instruction to both set and test bit

[uis9936 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122018

--- Comment #6 from uis <uis9936 at gmail dot com> ---
Bit test reset seems like common pattern too, not sure about complement, but
more optimizations is not less.