RFR: 8345438: Invalid error for return in early construction context lambda [v2]

[Archie Cobbs]

> The "Flexible Constructors" JEP feature allows statements to appear before a `super()` invocation, but some restrictions, one of which is that `return` is not allowed. The compiler check for this was being too strict in that it was incorrectly disallowing a `return` statement that was nested inside a lambda, which is OK.
> 
> Please review this patch to the `SuperThisChecker` which fixes this.

Archie Cobbs has updated the pull request incrementally with one additional commit since the last revision:

  Add a few more regression tests involving lambdas.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22531/files
  - new: https://git.openjdk.org/jdk/pull/22531/files/470684f8..0dce8b32

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22531&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22531&range=00-01

  Stats: 63 lines in 3 files changed: 62 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/22531.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22531/head:pull/22531

PR: https://git.openjdk.org/jdk/pull/22531