[Bug middle-end/115961] [15 Regression] wrong code on llvm-18.1.8 since r15-1936-g80e446e829d818 with bitfields less than the type mode precision

[slyfox at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115961

--- Comment #8 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
The change also fixes all llvm-18.1.8 testsuite failures for me. Thank you!