yajl: output json in larger chunks #380
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As a side effect, we're no longer creating short lived std::string objects.
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Previously,
wrap_writefunction was called frequently for small amounts of data. This resulted in FCGX_PutStr or some compression function showing up at the top of the perf trace. With this change in place, we're leveraging the YAJL internal buffer, and only output data once a certain threshold value is reached.