Turn off scalar_check for is_target for MultiLabelMarginCriterion, which is handled correctly in code. (#30766)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30766
Restacked version of: https://github.com/pytorch/pytorch/pull/30728
Test Plan: Imported from OSS
Differential Revision: D18821555
Pulled By: gchanan
fbshipit-source-id: 27acc72f82e94eddeea675ae66e010cfb2fc7421
