[Bug tree-optimization/66280] [4.8/4.9/5/6 Regression] ICE: in vect_get_vec_def_for_operand, at tree-vect-stmts.c:1472

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66280

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Which also fixes the original testcase on trunk!