Zhiming Wang <zmwa...@gmail.com> added the comment:

Turns out python 2.7.10 doesn't suffer from the performance issue even when 
compiled with stock clang 4.x, and upon further investigation, I tracked down 
the commit that introduced the regression:

    commit 2c992a0788536087bfd78da8f2c62b30a461d7e2
    Author: Benjamin Peterson <benja...@python.org>
    Date:   Thu May 28 12:45:31 2015 -0500
    
        backport computed gotos (#4753)

So Naoki was right that computed gotos is (solely) to blame here.

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