[Bug bootstrap/97806] [11 regression] bootstrap ICE starting with r11-4921

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97806

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
OK, happens because topological sorting is not correct for the case where we
have multiple expressions for a value in the set.