Antoine Pitrou added the comment:
You're right, CPU time is burnt by stackdepth_walk().
The underlying issue is that max stacksize is computed a bit pessimistically
with the new opcodes (JUMP_IF_{TRUE,FALSE}_OR_POP). On normal functions there
wouldn't be a sizable difference, but on pathological cases such as yours, a
code object could end up claiming a large stack size (as large of the number of
such opcodes) rather than a very small number.
Still, of course, stackdepth_walk() should not blow up when computing a large
stack size, but fixing the opcode's stack effect in compile.c seems to fix the
issue anyway.
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<http://bugs.python.org/issue21523>
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