[merge] Inline _unescape_xml_cached

[John Arbash Meinel]

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It turns out that the overhead from 350,000 calls to
_unescape_xml_cached was very measurable (about 500ms).

So this patch inlines the cache lookups to save some more time during
fileids_altered_by_revisions_ids. I'm now down to around 5.4s during
parsing of the whole inventory.

I'm going to try and not tune this function anymore, since I think I'm
about at the point of diminishing returns, versus other things which
should be much faster.

John
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