[jdk23u] RFR: 8338924: C1: assert(0 <= i && i < _len) failed: illegal index 5 for length 5

[Matias Saavedra Silva]

Backport of the changes JDK-8338924 and JDK-8335664. This patch is not clean since it excludes the changes to Problem list.

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Commit messages:
 - Backport 1353601dcc8f9ec3e12dea21dc61b3585a154b13

Changes: https://git.openjdk.org/jdk23u/pull/109/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk23u&pr=109&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338924
  Stats: 144 lines in 6 files changed: 134 ins; 6 del; 4 mod
  Patch: https://git.openjdk.org/jdk23u/pull/109.diff
  Fetch: git fetch https://git.openjdk.org/jdk23u.git pull/109/head:pull/109

PR: https://git.openjdk.org/jdk23u/pull/109