Made a few fields `final` in java.util.Scanner. Also made `digits`, `non0Digit`, `SIMPLE_GROUP_INDEX` as `static.`
------------- Commit messages: - [PATHC] Make fields final in java.util.Scanner Changes: https://git.openjdk.org/jdk/pull/14863/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14863&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8314129 Stats: 34 lines in 1 file changed: 17 ins; 0 del; 17 mod Patch: https://git.openjdk.org/jdk/pull/14863.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/14863/head:pull/14863 PR: https://git.openjdk.org/jdk/pull/14863
