[issue27127] Never have GET_ITER not followed by FOR_ITER

[Demur Rumed]

Demur Rumed added the comment:

Pretty small perf increase:

timeit("for a in range(256):pass", number=100000)
Without patch: ~2.1
With patch: ~1.84

pybench is 1-2% faster. Would prefer others' results. Especially a benchmark where it doesn't wrap payloads in for loops

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27127>
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