[issue4707] round() shows undocumented behaviour

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> >>> round(2, -2**31 + 2) # Press Ctrl + C
> Segmentation fault
> (backtrace below)

Thanks, Daniel.  It looks like I messed up the refcounting in the error-
handling section of the code.  I'll fix this.

I don't think the hang itself should be considered a bug, any more
than the hang from "10**(2**31-1)" is a bug.

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