[JIT] Remove warning in conv-add-relu fusion (#72441)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/72441
Previousl, if no implementation of conv-add-relu fusion was provided, a warning would be shown. This includes in CPU-only builds, where fusion isn't expected to occur (it's a gpu-only fusion, and only available in GPU builds of pytorch). In CPU-only builds the warning was confusing.
This removes the warning; in the case that the user wants the fusion to occur, they probably already have a pytorch build with gpu support.
Test Plan: Imported from OSS
Reviewed By: mruberry
Differential Revision: D34046350
Pulled By: davidberard98
fbshipit-source-id: d6a939ada81468025b40ec0a2af67517e4357c1a
(cherry picked from commit 21b3dfaf71742b5eb0b632d38cc00a0c226f9c8d)
