[bf16] Refine BF16 amp-o1 logic #39815
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Describe
完善 bf16 amp-o1实现逻辑：
该该逻辑与view机制存在不兼容问题：如
unsqueezeop 不在白名单中，在amp-o1下若其input是BF16，执行前会自动插入cast将input转为FP32，与view机制存在兼容问题。