[Bug middle-end/122412] Extra multiply with -Os due to `(unsigned>>6) * -64` not being simplified to `-(unsigned&0x3f)`

[rockeet at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122412

--- Comment #3 from rockeet <rockeet at gmail dot com> ---
gcc also did not handled __builtin_expect in this example, while clang
gracefully handled.