llvm-project

12628715 - [LegalizeTypes] Don't pad cttz_elts_zero_poison with ones when widening op (#206705)

[LegalizeTypes] Don't pad cttz_elts_zero_poison with ones when widening op (#206705) We only need to pad the widened lanes with ones to handle the case for an all zeroes input. But for cttz_elts_zero_poison, this is already poison. The RISC-V scalable vector test can't be precomitted because it crashes otherwise trying to lower a get_active_lane_mask from getMaskFromElementCount. Also while we're here, switch to using TLI.getTypeToTransformTo to be consistent with other `WidenVecOp_*` implementations.