Analysing time taken by gradgrad checks for Spectral Functions (#60435)
Summary:
**Description:** `SpectralFuncInfo` defines decorator mentioning: "gradgrad is quite slow". This PR re-analyses that statement since things have changed with gradient tests.
**Test times:** https://github.com/pytorch/pytorch/pull/60435#issuecomment-865658177
**Follow-up** of https://github.com/pytorch/pytorch/pull/57802
cc: mruberry
Pull Request resolved: https://github.com/pytorch/pytorch/pull/60435
Reviewed By: gchanan
Differential Revision: D29707444
Pulled By: mruberry
fbshipit-source-id: 444b4863bac8556c7e8fcc8ff58d81a91bd96a21
