Auto merge of #17142 - kenan-rhoton:LRUCacheArrayVecDeque, r=emilio

Move LRUCache to ArrayDeque crate

We move LRUCache from using VecDeque to ArrayDeque to avoid using heap allocations.

This relies on the fix in goandylok/arraydeque#4.

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- [X] These changes fix #17054 (github issue number if applicable).

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I additionally ran test-unit, because I'm paranoid.

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