More clever way to deal with infinite spans

[AndreiPashkin]

Let's suppose there is a some kind of long running function with some top-level function running an infinite loop. This function would produce an infinite span in the profile data which doesn't make a lot of sense. Currently such cases are handled by level-stripping, but that requires manual input from the library user which is of course undesirable.

The task is to come up with a method to handle such infinite spans automagically somehow.