[JIT][Easy]move remove mutation to own file (#41137)
Summary:
This should be in its own file...
Pull Request resolved: https://github.com/pytorch/pytorch/pull/41137
Reviewed By: jamesr66a
Differential Revision: D22437922
Pulled By: eellison
fbshipit-source-id: 1b62dde1a4ebac673b5c60aea4f398f734d62501
