Fix memory leak in CUDA renorm, turn off scalar_check for renorm. (#29873)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29873
Renorm requires at least 2-dimensions, so scalar_check could never succeed.
Test Plan: Imported from OSS
Differential Revision: D18521733
Pulled By: gchanan
fbshipit-source-id: 9701c750a14ce67e1bd63dd0753bd8863da42c17
