[cherry-pick] fix conv+conv compute error #4452
Merged
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修复conv+conv 融合在conv_dw和conv_1x1融合时的计算错误, 已在模型里验证其正确性
解决:conv+conv 融合计算weights,要求group0=1 且group1=1. 这样融合后的新weights不会影响第一个conv的conv_type