RFR: 8316879: RegionMatches1Tests fails if CompactStrings are disabled after JDK-8302163

[Alan Bateman]

On Mon, 25 Sep 2023 15:52:12 GMT, Aleksei Voitylov <avoitylov at openjdk.org> wrote:

> test java.lang.String.RegionMatches1Tests fails on all platforms with -XX:-CompactStrings option and on ARM32 where Compact Strings is disabled by default. The fix is to return true immediately if len is negative, since for negative length this condition will never be satisfied.
> 
> Testing: JCK, JTREG passed with the fix with -XX:-CompactStrings on x86_64 and on ARM32.

As Volker said, a test should be added. Also please have a maintainer working in this area review it too.

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PR Comment: https://git.openjdk.org/jdk/pull/15906#issuecomment-1734864795