Remove empty file (actual file_check.cpp resides in torch/csrc/jit/testing) (#18303)

Remove empty file (actual file_check.cpp resides in torch/csrc/jit/testing) (#18303)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18303
ghimport-source-id: 66f4402075b123e36c6ffdf806b7c93187a1a58a

Stack from [ghstack](https://github.com/ezyang/ghstack):
* #18307 Convert test_recursive_cse to use Filecheck inline annotations.
* #18306 [Filecheck] Add a feature to parse check annotations from string.
* #18305 Add python bindings for parseIR.
* **#18303 Remove empty file (actual file_check.cpp resides in torch/csrc/jit/testing)**

Differential Revision: D14586003

fbshipit-source-id: a13e57bd4302e4d3f06198068d525de25e2aa8b3