pytorch

26447259 - [SR] Migrate gather_ranges_to_dense to new FuseListUnpack (#67164)

[SR] Migrate gather_ranges_to_dense to new FuseListUnpack (#67164) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/67164 Migrated both the variadic and non-variadic versions. This diff is part of the effort to migrate all ops used in `FuseListUnpack` to `FuseListUnpackV2`. The original version of `FuseListUnpack` is problematic for a few reasons: * You have to complicate the op implementation with an `is_fused` check, resulting in messier code. It is easier to reason about two ops, fused (out variant) and unfused (native). * The original version of `FuseListUnpack` is buggy. It assumes that the `ListUnpack` node occurs immediately after the fusion candidate, which is not necessarily true. This diff finishes the migration, so the original version of `FuseListUnpack` is removed Test Plan: Unit tests: `buck test caffe2/benchmarks/static_runtime/...` **Accuracy Test** Done at the top of this diff stack. Reviewed By: hlu1 Differential Revision: D31887386 fbshipit-source-id: 9d44c813667a75bce13dce62bf98e6109edea6ba