[code-reflection] RFR: Local class model

[Mourad Abbay]

An attempt to model local classes.

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Commit messages:
 - Merge branch 'local-class' into local-class-model
 - Add class type attribute to ClassDecOp
 - Adopt the merge of MethodRef and ConstructorRef
 - Merge branch 'code-reflection' into local-class
 - Model local class (Iteration 1)

Changes: https://git.openjdk.org/babylon/pull/692/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=692&range=00
  Stats: 407 lines in 4 files changed: 353 ins; 0 del; 54 mod
  Patch: https://git.openjdk.org/babylon/pull/692.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/692/head:pull/692

PR: https://git.openjdk.org/babylon/pull/692