RFR: 8338060: jdk/internal/util/ReferencedKeyTest should be more robust

[Tom Rodriguez]

On Fri, 9 Aug 2024 15:54:51 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> Addressing latent issues with ReferencedKeyTest
> - During the `methods()` tests the keys should be strongly held to avoid inadvertent GC collection and subsequent test failures (JDK-8336926)
> - Merge changes from Valhalla to use String (identity objects) for keys instead of Integer and Long that are value objects. (JDK-8336390)

The changes look good to me.

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

Marked as reviewed by never (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20527#pullrequestreview-2233515552