RFR: 8330197: Make javac/diags/example release agnostic

[Joe Darcy]

Make recently added test cases release agnostic.

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Commit messages:
 - JDK-8330197: Make javac/diags/example release agnostic

Changes: https://git.openjdk.org/jdk/pull/18770/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18770&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330197
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/18770.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18770/head:pull/18770

PR: https://git.openjdk.org/jdk/pull/18770