codegen: do not generate code for dispatch_namespaced_definitions (#69074)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/69074
Reviewed By: jbschlosser
Differential Revision: D32758621
Pulled By: bdhirsh
fbshipit-source-id: f8a174fd9d74039003f9713d8dfaae2b4eaa7089
(cherry picked from commit 462e92c82d196ba27228db4e7e1d8195a7f07e08)
