Correct the result string coder of a string encoded using a CharsetDecoder with multi-byte encoded input. Added tests for UTF16 strings and a regression test.
------------- Commit messages: - 8325590: Regression in round-tripping UTF-16 strings after JDK-8311906 Changes: https://git.openjdk.org/jdk/pull/17817/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17817&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8325590 Stats: 24 lines in 2 files changed: 18 ins; 1 del; 5 mod Patch: https://git.openjdk.org/jdk/pull/17817.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/17817/head:pull/17817 PR: https://git.openjdk.org/jdk/pull/17817
