[Bug middle-end/68117] [6 Regression] error: invalid PHI argument <<< Unknown tree: >>>

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68117

--- Comment #24 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Forgot to mention: ggc_collect happens during pass_reload.