[Accuracy diff No.141] Fix accuracy diff for paddle.Tensor.__mul__
API
#74198
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PR Category
Operator Mechanism
PR Types
Bug fixes
Description
日志显示 bfloat16 cpu 反向精度问题,误差出现在累加的时候

同 ElemwiseGradBroadcast1CPU 和 ElemwiseGradBroadcast2CPU 一样为 CommonElementwiseBroadcastBackward 中的实际计算函数 CommonGradBroadcastCPU 添加类型提升。
PaddleAPITest 测试通过
