[Bug rtl-optimization/82192] [5/6/7/8 Regression] gcc produces incorrect code with -O2 and bit-field

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82192

--- Comment #14 from Segher Boessenkool <segher at gcc dot gnu.org> ---
I'll check if this patch regresses code quality on any target.  Looks
good though, thanks!