Turn off scalar_checks for multinomial_alias_setup_, which requires 1d tensors. (#29869)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29869
codegen changes: https://gist.github.com/gchanan/8e1b5184581fa37b27b6e856a75b470f
Test Plan: Imported from OSS
Differential Revision: D18521741
Pulled By: gchanan
fbshipit-source-id: a2674b55214b84032e7a821e8472d7df9e8a1dcb
