[issue1617161] Instance methods compare equal when their self's are equal

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

PR 7848 is based on method_compare.diff and 1617161_test_update.diff, but also makes types.MethodWrapperType unorderable, adds more tests and fixes some outdated tests.

This change can be considered as a bugfix, but since it can break the user code (unlikely), it may be safer to merge it only in 3.8 and expose as a new feature.

But changes to the hash of types.BuiltinMethodType may be backported. Currently the hash is not consistent with the equality.

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versions: +Python 3.8 -Python 3.6, Python 3.7

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<https://bugs.python.org/issue1617161>
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