Fix #7629 - scheduledForSynchronization leaks memory when using `@ORM\ChangeTrackingPolicy("DEFERRED_EXPLICIT")

[yethee]

Test to demonstrate unexpected behavior, related to issue #7629

[Ocramius]

So, I think that on master we need to take this bit and isolate it to a private method to be called also in case of a clean UnitOfWork:

orm/lib/Doctrine/ORM/UnitOfWork.php

Lines 429 to 439 in e8eaf83

	// Clean up
	$this->entityInsertions =
	$this->entityUpdates =
	$this->entityDeletions =
	$this->extraUpdates =
	$this->entityChangeSets =
	$this->collectionUpdates =
	$this->collectionDeletions =
	$this->visitedCollections =
	$this->scheduledForSynchronization =
	$this->orphanRemovals = [];

[Ocramius]

Thanks @yethee!