llvm-project

07688d13 - Revert "[LV] Add option to still enable the legacy cost model. (#99536)"

Revert "[LV] Add option to still enable the legacy cost model. (#99536)" This reverts commit 9ba524427321b931bad156860755adf420aeec6a. Remove the recently added temporary option vectorize-use-legacy-cost-model as discussed on the PR adding it, now that we branched for 19.x.