RFR: 8267529: StringJoiner can create a String that breaks String::equals

[Naoto Sato]

On Thu, 27 May 2021 17:38:42 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> This patch fixes a regression caused by https://bugs.openjdk.java.net/browse/JDK-8265237 where the result of String.join always get a UTF-16 coder if the delimiter is UTF-16, even when no delimiter is emitted.

Marked as reviewed by naoto (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/4228