Revert "bpo-40521: Remove freelist from collections.deque() (GH-21073)" (GH-24944)

This reverts commit 32f2eda85957365d208f499b730d30b7eb419741.
It can be re-applied if the subinterpreter PEP is approved.
Otherwise, the commit degraded performance with no offsetting
benefit.
1 file changed