Merge branch 'PHP-8.0'

* PHP-8.0:
Fix DCE of FREE of COALESCE

Note that this is a non-trivial merge, as opt/coalesce.phpt
regresses with this change. I'll have to see if i

Merge branch 'PHP-8.0'

* PHP-8.0:
Fix DCE of FREE of COALESCE

Note that this is a non-trivial merge, as opt/coalesce.phpt
regresses with this change. I'll have to see if it can be
improved.

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