RFR: 8337958: Out-of-bounds array access in secondary_super_cache [v2]

[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.

Andrew Haley has updated the pull request incrementally with one additional commit since the last revision:

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

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20483/files
  - new: https://git.openjdk.org/jdk/pull/20483/files/70cbbcd4..07169e59

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20483&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20483&range=00-01

  Stats: 4 lines in 2 files changed: 2 ins; 0 del; 2 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