【prim】update Prim optest about customvjp test, add FLAGS_comp_skip_default_ops

[xiaoguoguo626807]

PR Category

Execute Infrastructure

PR Types

Improvements

Description

pcard-67164

增加前向拆解默认跳过的list 包含 embedding, dropout 算子，原因是编译器不好处理embedding 拆解得到的gather 等算子， dropout 拆解的uniform和原始dropout的随机数生成无法对齐。

添加跳过前向拆解默认算子的flag, FLAGS_comp_skip_default_ops=True， 默认为true 表示默认不拆解上述算子，如需取消可以设置为false 与反向拆解FLAGS_prim_vjp_skip_default_ops 对应

修改prim_op_test 反向测试的逻辑，如果是custom_vjp 则反向需要跳过相应的前向算子拆解。 之前测试的是前向拆解结果自动微分得到的结果，修改为使用反向拆解的结果。

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