AbandonedList size fix #352
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This PR fixes a sizing bug that was hidden in the AbandonedList and surfaced only when a lot of pages was registered in it. It was noticed in #346 but treated as some garbage left in the list that was not cleared. It resurfaced again when working on Snap. This PR adds a memory fencing test and asserts that
AbandonedListdoes not reach beyond its size. The same same approach can be done for other structures.