[Bug tree-optimization/40073] Vector short/char shifts generate sub-optimal code

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40073

--- Comment #15 from Richard Biener <rguenth at gcc dot gnu.org> ---
The pattern recognizer could apply some of these tricks.  I'd rather not have
GIMPLE narrow the operations and putting in MIN/MAX ops to make the code not
undefined...