llvm-project

ef58670f - Revert [VPlan] Consolidate logic for narrowToSingleScalars (#170720)

Revert [VPlan] Consolidate logic for narrowToSingleScalars (#170720) This reverts commit 7b3ec51, as a crash was reported: https://llvm.godbolt.org/z/dK6ff5zvr -- this will give us time to investigate a re-land.