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

Mon Sep 25 16:00:49 UTC 2023

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.

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

Commit messages:
 - JDK-8316879 implementation

Changes: https://git.openjdk.org/jdk/pull/15906/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15906&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316879
  Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15906.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15906/head:pull/15906

PR: https://git.openjdk.org/jdk/pull/15906