[issue32385] Clean up the C3 MRO algorithm implementation.

[Serhiy Storchaka]

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

This has also a performance effect.

$ ./python -m perf timeit -s "class A: pass" -s "class B: pass" --duplicate 1000  "class C(A, B): pass"

Before: Mean +- std dev: 9.41 us +- 0.28 us
After:  Mean +- std dev: 8.94 us +- 0.28 us

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<https://bugs.python.org/issue32385>
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