Commits on Nov 17, 2021

1. Revert "Fix callable instance variable support (#10548)" …

   This reverts commit 6ab0efc.
   
   Reverting the change since it causes a significant backward
   compatibility break. Code like this previously worked as expected:
   
   ```
   class C:
       def f(self) -> None: pass
   
       g = f
   
   C().g()
   ```
   
   However, #10548 broke this in a subtle way (no error on definition),
   and instead required the introduction of a ClassVar annotation for
   `g`, which is non-intuitive and error-prone. For example, some
   typeshed stubs use method aliases such as the above (e.g. stubs for
   `logging`), and the change broke those stubs. It's also arguably
   inconsistent, since normally ClassVar annotations are optional.
   
   Any fix to the original issue should avoid breaking method aliases
   such as the above. Hopefully the fix can be adjusted suitably.
   
   The PR may have broken incremental mode somehow as well -- cached
   and uncached runs sometimes produce different results. The root
   cause is still unclear, however.

   

   JukkaL committed Nov 17, 2021
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