【Cherry-pick PR 37420】fix inplace bug when the first grad_var(loss_grad) is inplace var#37488

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lanxianghit merged 1 commit intoPaddlePaddle:release/2.2from pangyoki:fix_loss_is_inplace_var_bug

Nov 25, 2021

+34-6

Commits on Nov 23, 2021

Cherry-pick PR 37420, fix inplace bug when the first grad_var(loss_grad) is inplace var (PaddlePaddle#37420 )
pangyoki
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