Reuse the optimized putCharsAt method of StringLatin1 and StringUTF16 in PR #19626 to simplify the code, eliminate boundary checks, and improve performance
------------- Commit messages: - use StringLatin1::putCharsAt and StringUTF16::putCharsAt Changes: https://git.openjdk.org/jdk/pull/21907/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21907&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8343650 Stats: 36 lines in 1 file changed: 0 ins; 28 del; 8 mod Patch: https://git.openjdk.org/jdk/pull/21907.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/21907/head:pull/21907 PR: https://git.openjdk.org/jdk/pull/21907
