[RSS Feed/News] Improve error reporting when OOM occurs

[XenForo]

Currently XenForo essentially hard falls over when an OOM error occurs, and fails to log OOM errors.

There are strategies to work-around (discussed here);

• Pre-reserve a chunk of memory at startup
• In the shutdown handler;
  • Try call ini_set('memory_limit') with a higher limit.
  • Release the reserve and/or clear various caches before any operation which could allocate. (including other function calls!)

This doesn't work in all cases, but it would work in a...

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