Fix infinite loop in update_enumeration_type_from_children

[Daniel Colascione]

On 10/08/2014 06:58 AM, Doug Evans wrote:
> Changing the loop to a for loop is another way to go, and arguably preferable.

Either way, it looks like this bug is unfixed in master. Now that I have
papers, can this patch (or an equivalent for-loop version) be committed?

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