INADA Naoki added the comment:

I setup Ubuntu 14.04 on Azure, built python without neither PGO nor LTO.
But I failed to reproduce it.

@haypo, would you give me two binaries?

$ ~/local/py-2a143/bin/python3 -c 'import sys; print(sys.version)'
3.7.0a0 (default:2a14385710dc, Nov 22 2016, 12:02:34) 
[GCC 4.8.4]

$ ~/local/py-acde8/bin/python3 -c 'import sys; print(sys.version)'              
                                                                      
3.7.0a0 (default:acde821520fc, Nov 22 2016, 11:31:16) 
[GCC 4.8.4]

$ ~/local/py-2a143/bin/python3 bm_call_method.py 
.....................
call_method: Median +- std dev: 16.1 ms +- 0.6 ms

$ ~/local/py-acde8/bin/python3 bm_call_method.py                                
                                                                      
.....................
call_method: Median +- std dev: 16.1 ms +- 0.7 ms

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28618>
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