[Bug tree-optimization/83914] [8 Regression] ice in vect_is_simple_use with -O3

[rsandifo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83914

--- Comment #5 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> 
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Started with r256630 (so definitely mine)