Fix compilation with gcc-9+ (#3262)

Summary:
To fix `cannot resolve overloaded function ‘isinf’ based on conversion to type ‘torch::executor::FunctionRef<bool(double)>’` error

Not sure how it ever worked before see https://godbolt.org/z/939YKdjqW

Pull Request resolved: https://github.com/pytorch/executorch/pull/3262

Reviewed By: kimishpatel, manuelcandales

Differential Revision: D56501235

Pulled By: malfet

fbshipit-source-id: 6f89beef9fd56a80ecbb2df573821da95b2da746