If any of the values we chose as translated PHI operands
change, we have to re-evaluate the phi-of-ops for
I. We already record additional dependencies for
the phi translated operands, but we miss the link
to the translated operand. Those can change without
without their operands changing, e.g. if the leader
of their congruence class changes.
Even with this patch, there are still some dependencies
missing. I will continue tackling the outstanding
reporeted crashes in this area.
Fixes PR36501, PR42422, PR42557.