[issue31336] Speed up _PyType_Lookup() for class creation

[STINNER Victor]

STINNER Victor added the comment:

I ran a microbenchmark on the current PR 3279 using:

./python -m perf timeit --inherit=PYTHONPATH 'class C: pass'

Result:

haypo at selma$ ./python -m perf compare_to ref.json patch.json 
Mean +- std dev: [ref] 9.71 us +- 0.38 us -> [patch] 8.74 us +- 0.22 us: 1.11x faster (-10%)

I compiled Python using "./configure && make", no LTO nor PGO.

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