May fix TopKTypeConfig<at::Half> without an additional Bitfield specialization (#36077)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/36077
Test Plan: Imported from OSS
Differential Revision: D20872623
Pulled By: gchanan
fbshipit-source-id: 9363dfc22cc316fa9e845f8b479da7894976079f
