Change flags for mp async all reduce #56456
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… mp_async_all_reduce
control following behaviors: 1. export Flags_mp_aysnc_allreduce=True to turn on mp async all_reduce 2. export Flags_skip_mp_c_identity=True to skip two c_identity operators in dygraph mode. 3. export Flags_fused_linear_param_grad_add to enable fused_linear_param_grad_add in ColumnParallel backward with mp async all_reduce.
… mp_async_all_reduce
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BeingGod
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Description
PCard-70444
Use flags in distributed_strategy to control mp_async_allreduce.