[Bug middle-end/62263] Good codegen for bitwise rotate requires code that is technically undefined behavior

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62263

--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> ---
Also, I would have expected the pattern *<rotate_insn><mode>3_mask to avoid
generating 'andl' before 'roll'.