[Dy2Static]Add param_guard in ParameterList to support @to_static

[Aurelius84]

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Bug fixes

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Add param_guard in ParameterList to support @to_static

Before this PR， if Model codes use ParameterList as container in __init__() function, it will cause No Input(X) error while applying @to_static to convert into static program.

See the following code, this PR fixed this bug.

class NetWithParameterList(paddle.nn.Layer):
    def __init__(self, in_size, out_size):
        super(NetWithParameterList, self).__init__()
        weight = self.create_parameter([in_size, out_size])
        bias = self.create_parameter([out_size], is_bias=True)
        self.params = paddle.nn.ParameterList([weight, bias])

    @to_static
    def forward(self, x):
        out = paddle.matmul(x, self.params[0])   # Cause `No Input(X)` error 
        out = paddle.add(out, self.params[1])
        out = paddle.tanh(out)
        return out

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[liym27]

LGTM