[Dy2stat] Fix Read-Only Attribute as while_loop Output (#31415)
Fix Read-Only Attribute as while_loop Output: Usually, our convert_while_loop will be like: ``` [a, b, c] = paddle.jit.dy2static.convert_while_loop( condition_name, body_name, [a, b, c]) ``` where a, b, c are in loop_var_names. However, if loop_var_names contains property such as foo.x, we cannot assign the attribute as output of convert_while_loop because Python property is a kind of read-only attribute. To handle the case, we replace the attributes which are output of convert_while_loop with generated variables, then if we know the attribute is not read-only at runtime, we assign the attribute. The created statements are like: ``` [a, b, __attribute_variable_1] = paddle.jit.dy2static.convert_while_loop( condition_name, body_name, [a, b, foo.x]) if not isinstance(getattr(type(foo), x, None), property): foo.x = __attribute_variable_1 ```
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