support float64 for GradClipByGlobalNorm in dygraph, test=develop (#21401)
* support float64 for GradClipByGlobalNorm in dygraph, test=develop * fix comment for GradClipByGlobalNorm, test=develop
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Fork自 PaddlePaddle / Paddle
* support float64 for GradClipByGlobalNorm in dygraph, test=develop * fix comment for GradClipByGlobalNorm, test=develop