RFR: JDK-8277520: Implement JDK-8 default methods for IdentityHashMap

[liach]

On Wed, 24 Nov 2021 05:16:40 GMT, liach <duke at openjdk.java.net> wrote:

> Might need a CSR as now `computeIfAbsent` `computeIfPresent` `compute` `merge` would throw CME if the functions modified the map itself, and there are corresponding specification changes.

Just curious, what else is recommended for such additions? Is there any recommended tests (though previous additions of `forEach` and `replaceAll` did not add any)

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PR: https://git.openjdk.java.net/jdk/pull/6532