Move scalar_check from codegen to code in MultiLabelMarginCriterion. (#30770)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30770
Restacked version of: https://github.com/pytorch/pytorch/pull/30753
Test Plan: Imported from OSS
Differential Revision: D18821556
Pulled By: gchanan
fbshipit-source-id: 64b7311b1eb3855c4f1981d060accc918b99088d
