Migrate lerp from CUDA_tensor_apply3 to TensorIterator (#34025)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/34025
Test Plan: Imported from OSS
Differential Revision: D20196079
Pulled By: VitalyFedyunin
fbshipit-source-id: 150d1de6632c58850020b73ee72e0ed380072926
