RFR: 8374643: Fix reference to implMethodKind in LambdaToMethod debug printf statement [v3]

[Liam Miller-Cushon]

> This change extracts a local variable, to allow the commented-out printf debug statement below to work without additional modifications.
> 
> 
> System.err.printf("*implMethodKind: %d\n", implMethodKind);

Liam Miller-Cushon has updated the pull request incrementally with one additional commit since the last revision:

  Fix test/langtools/tools/javac/diags/CheckExamples.java

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29072/files
  - new: https://git.openjdk.org/jdk/pull/29072/files/67f1f7e4..5e3b7191

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29072&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29072&range=01-02

  Stats: 31 lines in 1 file changed: 31 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/29072.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29072/head:pull/29072

PR: https://git.openjdk.org/jdk/pull/29072