[lworld] RFR: 8340409: [lworld] Simple serialization and deserialization of core migrated classes [v2]

[Roger Riggs]

> Serialization and deerialization of value classes. 
> For java.base value classes migrated from identity classes:
>   - Must be annotated with jdk.internal.MigratedValueClass (in tests too)
>   - Must have a constructor or static factory method:
>     - annotated with jdk.internal.value.DeserializeConstrucctor
>     - constructor parameters must match order and types of serializable fields of the class
>   - Value class must not have superclass with fields; only Object or abstract w/o fields
>   - Uses same technique as for Records to extract and concat values from stream to invoke constructor
>   - Migrated value classes are serialized using the same format/fields as the identity class
> 
> Non-migrated value classes throw InvalidClassException
> 
> Along the way, refactored code to break out different modes of deserialization: full custom deserialization with custom data, default deserialization only, externalizable, no local class, record, and then added mode to deserialize a value class.
> 
> Updates to value class tests and added a combo test to check many combinations of value and identity classes with different parameters.

Roger Riggs has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:

 - Merge branch 'lworld' into 8340409-simple-value-deserialize
 - Merge branch 'lworld' into 8340409-simple-value-deserialize
 - 8340409: [lworld] Simple serialization and deserialization of core migrated classes
   
   Serialization and deerialization of value classes.
   For java.base value classes being migrated from identity classes:
     - Must be annotated with jdk.internal.MigratedValueClass (in tests too)
     - Must have a constructor or static factory method:
       - annotated with jdk.internal.value.DeserializeConstrucctor
       - constructor parameters must match order and types of serializable fields of the class
     - Value class must not have superclass with fields; only Object or abstract w/o fields
     - Uses same technique as for Records to extract and concat values from stream to invoke constructor
     - Migrated value classes are serialized using the same format/fields as the identity class
   
   Non-migrated value classes throw InvalidClassException
   
   Along the way, refactored code to break out different modes of deserialization:
   full custom deserialization with custom data, default deserialization only,
   externalizable, no local class, record, and then added mode to deserialize a value class.
   
   Updates to value class tests and added a combo test to check many combinations
   of value and identity classes with different parameters.

-------------

Changes: https://git.openjdk.org/valhalla/pull/1248/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1248&range=01
  Stats: 3169 lines in 21 files changed: 2584 ins; 423 del; 162 mod
  Patch: https://git.openjdk.org/valhalla/pull/1248.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1248/head:pull/1248

PR: https://git.openjdk.org/valhalla/pull/1248