Anselm Kruis added the comment:

It's indeed a very low priority issue.

You mention VS2008 and VS2010 PGO compiler bugs. I'm aware of the VS 2010 bugs, 
but I didn't observe any VS 2008 PGO bug with Python 2.7. Are you aware of any 
publicly available bug reports?

About the black/white list. I started with a black list, but then I switched to 
a white list for the following reason: the goal of running the test suite is to 
generate a reasonable profile. It is not a goal to test anything. Therefore 
both white list and black listing is possible.
I consider it more likely that a newly added test breaks the PGO build than 
that an existing test will be modified in a breaking way. Therefore I consider 
the while list superior for this particular application.

But as you already stated, it is low prio.

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<http://bugs.python.org/issue17667>
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