1. Reduce duplicate stringSize code 2. Move java.lang.StringLatin1.getChars to jdk.internal.util.DecimalDigits::getCharLatin1，not only java.lang, other packages also need to use this method
------------- Commit messages: - move StringLatin1::getChars to jdk.internal.util.DecimalDigits::getCharsLatin1 - move *::stringSize to jdk.internal.util.DecimalDigits::stringSize Changes: https://git.openjdk.org/jdk/pull/15699/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15699&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8316150 Stats: 374 lines in 9 files changed: 153 ins; 190 del; 31 mod Patch: https://git.openjdk.org/jdk/pull/15699.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/15699/head:pull/15699 PR: https://git.openjdk.org/jdk/pull/15699
