Message 339621 - Python tracker

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Content 
More benchmarks for slow iterators:

import perf

runner = perf.Runner()
runner.timeit("list_comp",
               stmt="[x**2 for x in k]",
               setup="k=iter(list(range(10)))")


Current master:
❯ ./python.exe ../check.py
.....................
list_comp: Mean +- std dev: 924 ns +- 35 ns

PR 12718:
❯ ./python.exe ../check.py
.....................
list_comp: Mean +- std dev: 1.17 us +- 0.06 us