WIP: Support pickling lru_cache on CPython#309

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ssanderson wants to merge 3 commits intomasterfrom

Commits on Oct 14, 2019

ENH: Support pickling functions decorated with functools.lru_cache.
Scott Sanderson
committed
TEST: Skip lru_cache tests on pypy.
Scott Sanderson
committed
MAINT: Handle IS_PYPY check consistently.
Scott Sanderson
committed