[Dy2stat]Support for i in [x,y,z] statements in dy2stat

[0x45f]

PR types

Others

PR changes

Others

Describe

该PR使得动转静模块能够正确转换如下的for i in [1, 2, 3]语句。

import paddle
class Net(paddle.nn.Layer):
    @paddle.jit.to_static
    def forward(self):
        # import pdb; pdb.set_trace()
        for i in [1, 2, 3]:
            print(i)
net = Net()
net()

PR中对List和Tuple进行了支持；对于Dict，由于动转静会改写生成类似Dict[index]的语句，比如
{'a': 1, 'b': 2}[__for_loop_var_index_0]这样的语句是错误，所以如果要支持Dict，还需要进行其他的修改。

[paddle-bot-old]

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[Aurelius84]

LGTM

[Aurelius84]

LGTM