Florian Hahn c5109be53b [LV] Disable epilogue vectorization for FindLastIV if start is poison.
Back-porting properly freezing of the start value during epilogue
vectorization (2bdc1a1337) is non-trivial. For the 20.x release, just
disable epilogue vectorization for FindLastIV reductions where the start
value may be poison or undef.

Fixes #126836.
2025-04-15 14:14:15 -07:00
..