RFR: 8337958: Out-of-bounds array access in secondary_super_cache

[Andrew Haley]

The fix for [JDK-8180450](https://bugs.openjdk.org/browse/JDK-8180450), secondary_super_cache does not scale well, has a rare (and benign) out-of-bounds array access. While this bug is very unlikely ever to cause a failure, it should be fixed.

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

Commit messages:
 - JDK-8337958: Out-of-bounds array access in secondary_super_cache

Changes: https://git.openjdk.org/jdk/pull/20483/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20483&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8337958
  Stats: 11 lines in 3 files changed: 1 ins; 1 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/20483.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20483/head:pull/20483

PR: https://git.openjdk.org/jdk/pull/20483