[Bug rtl-optimization/83098] [8 regression] ICE in assert_rtx_eq_at, at selftest-rtl.c:57

[rsandifo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83098

--- Comment #1 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> 
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This sounds like it might be an instance of what Jakub reported here: 
https://gcc.gnu.org/ml/gcc-patches/2017-11/msg01957.html

(Note: I've not committed anything during this period!)