CCE001 triggers on dependent attributes

[stdedos]

Describe the bug

class T:
    _d = "a"
    M = _d

$ flake8 test.py 
Unable to find qualified name for module: test.py
`file_tokens` will be removed in a future version
test.py:1:1: D100 Missing docstring in public module
test.py:1:1: D101 Missing docstring in public class
test.py:2:5: CCE001 T._d should be after T.M
test.py:3:5: VNE001 single letter variable names like 'M' are not allowed

but the fix gives:

$ python3 test.py
Traceback (most recent call last):
  File "test.py", line 1, in <module>
    class T:
  File "test.py", line 2, in T
    M = _d
NameError: name '_d' is not defined

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Expected behavior
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• Browser [e.g. chrome, safari]
• Version [e.g. 22]

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