[code-reflection] RFR: Ensure this capture is noted for use in argument of JCNewClass

[Paul Sandoz]

The `QuotableLambdaCaptureScanner` scanner neglected to visit the arguments of tree node `JCNewClass` so for say:


() -> new String(toString());


The implicit use of `this` in `this.toString()` would be skipped, and results in an exception later as there was no block parameter declared corresponding to `this`.

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Commit messages:
 - Ensure this capture is noted for use in argument of JCNewClass

Changes: https://git.openjdk.org/babylon/pull/376/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=376&range=00
  Stats: 64 lines in 3 files changed: 64 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/babylon/pull/376.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/376/head:pull/376

PR: https://git.openjdk.org/babylon/pull/376