Fix xpu_fuse_pass error caused by weight sharing by other operators. #51039
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GPT 345M 模型中，遇到 lookup_table，matmul + elementwise_add 算子共享权重的情况。在 xpu_fuse_pass 中，会将 fc 中的权重量化成 int16，导致 lookup_table 算子中的权重无法使用。 因此在共享权重的情况下，不进行 matmul + elementwise_add 融合。