Migrate ArrayListCodec off of Unsafe. ArrayListCodec no longer uses Unsafe.allocateInstance and Unsafe.putObject to inject elementData and size. Instead, it uses VarHandles for those private fields, obtained with MethodHandles.privateLookupIn, to make a new ArrayList wrap an Object[] of the final size before registering it. Elements are then written directly into that array using deserializeArrayElement as they become available, possibly concurrently. There's no intermediate buffer or copy, and as before, a backreference to the list from one of its own elements resolves to the same instance and observes the list's final size. The fields aren't final, so writing them is unaffected by JEP 500. The VarHandles require opening java.base/java.util, which is declared with add_opens on the serialization library. This also places it in the Blaze LC's JAR manifest. PiperOrigin-RevId: 1008219479 Change-Id: I5616a5165311dc73d36c6a930e7489a4c9698c59
{Fast, Correct} - Choose two
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See CONTRIBUTING.md
