[Bug target/117690] [15 Regression] RISC-V: Constant is miscompiled by zba extension

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117690

--- Comment #3 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Looks like it's missing the shift to move bits into the upper half.