RFR: 8267860: Off-by-one bug when searching arrays in AlpnGreaseTest [v2]

[Kevin Driver]

> This PR resolves: https://bugs.openjdk.org/browse/JDK-8267860

Kevin Driver has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'openjdk:master' into JDK-8267860
 - Update AlpnGreaseTest.java
 - JDK-8267860: off-by-one error

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9131/files
  - new: https://git.openjdk.org/jdk/pull/9131/files/507abec6..11379da8

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=9131&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=9131&range=00-01

  Stats: 901 lines in 25 files changed: 616 ins; 53 del; 232 mod
  Patch: https://git.openjdk.org/jdk/pull/9131.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9131/head:pull/9131

PR: https://git.openjdk.org/jdk/pull/9131