[PATCH 1 of 2] parsers: simplify error logic in compute_phases_map_sets

[Bryan O'Sullivan]

On Sat, Dec 12, 2015 at 11:30 PM, Yuya Nishihara <yuya at tcha.org> wrote:

> Oops, I found PyErr_NoMemory() was missing here.
>

I'll follow up with a revised patch.
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