RFR: 8365703: Refactor ZipCoder to use common JLA.uncheckedNewStringNoRepl [v3]

[Roger Riggs]

> Simplify JLA by changing ZipCoder to use JLA.uncheckedNewStringNoRepl(byte[] bytes, Charset cs) instead of the JLA.newStringUTF8NoRepl.
> A copy of the bytes is made so it can be exclusively used to create the string. The "shared" flag is no longer needed in String.newStringUTF8NoRepl.

Roger Riggs has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:

 - Merge
 - Flesh out javadoc in src/java.base/share/classes/java/lang/String.java
   
   Co-authored-by: Volkan Yazıcı <volkan.yazici at oracle.com>
 - 8365703: Refactor ZipCoder to use common JLA.uncheckedNewStringNoRepl
   
   Simplify JLA by changing ZipCoder to use JLA.uncheckedNewStringNoRepl(byte[] bytes, Charset cs)
   instead of the JLA.newStringUTF8NoRepl.
   A copy of the bytes is made so it can be exclusively used to create the string.
   The "shared" flag is no longer needed in String.newStringUTF8NoRepl.

-------------

Changes: https://git.openjdk.org/jdk/pull/26822/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26822&range=02
  Stats: 44 lines in 4 files changed: 20 ins; 17 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/26822.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26822/head:pull/26822

PR: https://git.openjdk.org/jdk/pull/26822