sam marshall 0b2c2a1f95 MDL-76129 upgrade: Allow caching in specific functions
During install/upgrade, caching is disabled. This change provides a
way to temporarily enable caching (using in-memory cache storage only)
within a specific function; caches are deleted afterwards.

Adding this to two locations improves install performance quite a lot.

Caching is not enabled during the parts of plugin installation that
can vary for individual plugins (install.php/upgrade.php) as these
might be relying on its absence, for example by making direct database
changes.
2022-12-22 11:05:45 +00:00
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