RFR: 8333766: Stack overflow with anonymous class in super() parameter

[Maurizio Cimadamore]

This patch fixes an issue in `LambdaToMethod` where the wrong code is generated to access a symbol in the enclosing scope.

`LambdaTranslationContext::addSymbol` has some logic to avoid referring to `T.this` when `T` is a type under construction. This fix works well when a lambda is directly enclosed in a `super` or `this` call, but does not scale to more complex cases, such as the one in this issue.

A more complete fix needs to check whether the target `T.this` is really available via a chain of enclosing `this$n` fields. If that's not the case, then `T.this` must be captured by the lambda more directly, as there's no *path* to it from the innermost enclosing this.

To detect that, I've added a method (`outerThisReachable`) which more or less mimic the lookup logic in `Lower::makeOwnerThisN`.

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Commit messages:
 - Fix whitespaces
 - Initial push

Changes: https://git.openjdk.org/jdk/pull/19604/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19604&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333766
  Stats: 283 lines in 5 files changed: 279 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/19604.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19604/head:pull/19604

PR: https://git.openjdk.org/jdk/pull/19604