Migrate ImmutableListCodec off of Unsafe. ImmutableListCodec still registers the list before deserializing its elements, to support cycles, but no longer uses Unsafe.allocateInstance or Unsafe.putObject. * Lists with two or more elements are created by calling the package-private RegularImmutableList constructor through a MethodHandle obtained with MethodHandles.privateLookupIn. The constructor wraps the given array without copying, so elements are deserialized directly into it. This is possible because Guava is in an unnamed module. * Lists with a single element are created with ImmutableList.of(placeholder), and the final SingletonImmutableList.element field is overwritten once the actual element is available, through a MethodHandle from Lookup.unreflectSetter. This is subject to JEP 500 restrictions on final field mutation. This also removes one of the remaining callers of the offset-based AsyncDeserializationContext.deserialize overload. PiperOrigin-RevId: 1008904532 Change-Id: Idfcb147c3889e5df288907b436a372aaa81d7cf9
{Fast, Correct} - Choose two
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