pytorch

dec62dbf - Change VmapTransforms to use SmallVector instead of `vector<int64_t>` (#40042)

Change VmapTransforms to use SmallVector instead of `vector<int64_t>` (#40042) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/40042 See title. Dynamic allocations are generally bad for performance. This change was not benchmarked because we have not gotten to the stage where we want to benchmark performance. Test Plan: - `./build/bin/vmap_test` Differential Revision: D22070656 Pulled By: zou3519 fbshipit-source-id: f6cf74a357bb52b75c0a02f1f82495c0a5329a28