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Disable the GC if running under PHP 7.2

PHP 7.2 has a fixed-size GC root buffer which turns out to be far too
small when parsing large articles. The GC is invoked very often, as
memory usage grows, but rarely detects any cycles. This overly frequent
invocation of the GC on large data structures causes very slow parsing.

PHP 7.3 has a dynamically sized GC root buffer, tuned to collect a
certain number of cycles per invocation, which avoids this problem.

Bug: T230861
Change-Id: I72e82e19e

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