We haven't updated our documentation yet, because we haven't tested with TFS 2015 vNext builds yet. I am sorry about that. However, we have a customer who successfully managed to resolve the issue by setting the environment variables on the machine.
As enabling the profiler requires setting 3 environment variables
you can find a way to incorporate that into your build setup or do that in your build script. Let us know if you manage to resolve the issue.
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