[Bug tree-optimization/92655] Suboptimal vectorization of variable shift

[rsandifo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92655

--- Comment #3 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> 
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Maybe we could check in vect_determine_min_output_precision_1
whether the result is used as a shift amount, and if so do:

  precision = MAX (precision, use_stmt_info->min_output_precision);