Support float16 when using ClipGradByGlobalNorm. #33565
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This PR supports gradient clip (ClipGradByGlobalNorm) when training with AMP(auto mixed precision).
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This PR supports gradient clip (ClipGradByGlobalNorm) when training with AMP(auto mixed precision).
Grad_clip 操作对于混合精度的tensor会出现错误，原因是因为grad_clip里，
有sum和reduce_sum等操作不支持fp16数据类型，或者不支持sum一个混合精度的tensor。
该PR支持在grad_clip（ClipGradByGlobalNorm）里分别sum fp16和fp32的tensor作为global scale。