Made the two fields `input` and `index` final, this didn't need any test changes as far as I could tell so this PR is longer than the diff
------------- Commit messages: - made input and index fields final Changes: https://git.openjdk.org/jdk/pull/12415/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12415&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8300177 Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod Patch: https://git.openjdk.org/jdk/pull/12415.diff Fetch: git fetch https://git.openjdk.org/jdk pull/12415/head:pull/12415 PR: https://git.openjdk.org/jdk/pull/12415
