[issue17787] Optimize pickling function dispatch in hot loops.

[Alexandre Vassalotti]

Alexandre Vassalotti added the comment:

I found a bug in the pickle_list benchmark. These are the new results:

### fastpickle ###
Min: 0.603416 -> 0.542480: 1.11x faster
Avg: 0.628639 -> 0.575296: 1.09x faster
Significant (t=6.29)
Stddev: 0.03330 -> 0.04985: 1.4969x larger
Timeline: http://tinyurl.com/c7xm7p6

### pickle_list ###
Min: 0.366062 -> 0.317290: 1.15x faster
Avg: 0.391959 -> 0.331500: 1.18x faster
Significant (t=15.86)
Stddev: 0.02131 -> 0.01651: 1.2910x smaller
Timeline: http://tinyurl.com/cad2mkx

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17787>
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