pre compute regex and match simple signature autograd codegen 15s -> 12s (#59852)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59852
This whole stack does not change anything to the codegened code
Test Plan: Imported from OSS
Reviewed By: ezyang
Differential Revision: D29063814
Pulled By: albanD
fbshipit-source-id: a751047526f8d58f4760ee6f9ae906675bed5d75
