[jdk11u-dev] RFR: 8266675: Optimize IntHashTable for encapsulation and ease of use

[Guoxiong Li]

Hi all,

This pull request contains a backport of commit [ff77ca8b](https://github.com/openjdk/jdk/commit/ff77ca8bd41ece778cf6f1af6dd1b7a7dfc50eab) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The code applies cleanly. Just a small enhancement and low risk.

Best Regards,
-- Guoxiong

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Commit messages:
 - Backport ff77ca8bd41ece778cf6f1af6dd1b7a7dfc50eab

Changes: https://git.openjdk.org/jdk11u-dev/pull/1210/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1210&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8266675
  Stats: 46 lines in 2 files changed: 10 ins; 19 del; 17 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1210.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1210/head:pull/1210

PR: https://git.openjdk.org/jdk11u-dev/pull/1210