[code-reflection] RFR: Support record pattern for generic records [v3]

[Mourad Abbay]

> Support record pattern for generic records

Mourad Abbay has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - Merge branch 'code-reflection' into record-pattern
 - Add tests
 - Use externalize method in toString of RecordTypeRefImpl, MethodRefImpl and FieldRefImpl
 - Modify TypeVarRef.toString to print more info about type variable

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Changes:
  - all: https://git.openjdk.org/babylon/pull/240/files
  - new: https://git.openjdk.org/babylon/pull/240/files/538a7d8c..8dca783f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=240&range=02
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=240&range=01-02

  Stats: 15 lines in 2 files changed: 8 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/babylon/pull/240.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/240/head:pull/240

PR: https://git.openjdk.org/babylon/pull/240