Message 265938 - Python tracker

> unpickle_list: 1.11x faster

This result was unfair: my fastcall branch contained the optimization of the issue #27056. I just pushed this optimization into the default branch.

I ran again the benchmark: the result is now "not significant", as expected, since the benchmark is a microbenchmark testing C functions of Modules/_pickle.c, it doesn't really rely on the performance of (C or Python) functions calls.