Benchmark on fastint5_4.patch.

python3 -u perf.py --affinity=2-3,6-7 --rigorous ../default/python.orig ../default/python_fastint5_4

Report on Linux smithers 4.3.4-300.fc23.x86_64 #1 SMP Mon Jan 25 13:39:23 UTC 2016 x86_64 x86_64
Total CPU cores: 8

### django_v3 ###
Min: 0.563959 -> 0.578181: 1.03x slower
Avg: 0.565383 -> 0.579137: 1.02x slower
Significant (t=-152.48)
Stddev: 0.00075 -> 0.00050: 1.4900x smaller

### fastunpickle ###
Min: 0.551076 -> 0.563469: 1.02x slower
Avg: 0.555481 -> 0.567028: 1.02x slower
Significant (t=-27.05)
Stddev: 0.00278 -> 0.00324: 1.1687x larger

### json_dump_v2 ###
Min: 2.737429 -> 2.662615: 1.03x faster
Avg: 2.754239 -> 2.685404: 1.03x faster
Significant (t=55.63)
Stddev: 0.00610 -> 0.01077: 1.7662x larger

### nbody ###
Min: 0.228548 -> 0.212292: 1.08x faster
Avg: 0.230082 -> 0.213574: 1.08x faster
Significant (t=73.74)
Stddev: 0.00175 -> 0.00139: 1.2567x smaller

### regex_v8 ###
Min: 0.041323 -> 0.048099: 1.16x slower
Avg: 0.041624 -> 0.049318: 1.18x slower
Significant (t=-45.38)
Stddev: 0.00123 -> 0.00116: 1.0613x smaller

The following not significant results are hidden, use -v to show them:
2to3, chameleon_v2, fastpickle, json_load, tornado_http.