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Turn on garbage collection for Parsoid cluster
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Currently we disable garbage collection on the Parsoid cluster.

There were originally gc bugs (T228346: PHP 7.2 garbage collector segfault) but there were also some performance improvements obtained by turning off gc (T230861: PHP 7.2 is very slow on an allocation-intensive benchmark).

We need to re-enable garbage collection (and fix any performance regressions) before we can use Parsoid directly on the main mediawiki cluster.