RFR: 8321514: UTF16 string gets constructed incorrectly from codepoints if CompactStrings is not enabled [v3]

[Aleksei Voitylov]

> Since JDK-8311906, if CompactStrings is not enabled, index is not considered when calling extractCodepoints from StringUTF16.toBytes(). Because of that the last elements of the source codepoints array are stripped from the resulting UTF16 string, which fires in other places (e.g. during RegEx processing).
>  
> The fix replaces len in extractCodepoints parameters with end that is index + len.

Aleksei Voitylov has updated the pull request incrementally with one additional commit since the last revision:

  review comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17057/files
  - new: https://git.openjdk.org/jdk/pull/17057/files/759068e8..cf622fae

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17057&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17057&range=01-02

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17057.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17057/head:pull/17057

PR: https://git.openjdk.org/jdk/pull/17057