Add `__matmul__` to the magic methods for FX tracing (#64512)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/64483
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64512
Reviewed By: mrshenli
Differential Revision: D30797265
Pulled By: Chillee
fbshipit-source-id: 7630e048a960e0b27c4309d04d85301abe325189
