RFR: JDK-8277520: Implement JDK-8 default methods for IdentityHashMap [v2]

[liach]

On Thu, 16 Dec 2021 20:48:39 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.
>
> liach 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 five additional commits since the last revision:
> 
>  - Merge branch 'master' of https://git.openjdk.java.net/jdk into identityhashmap-default
>  - update dates
>  - Also test cme for identity hash map
>  - Fix putIfAbsent
>  - JDK-8277520: Implement JDK-8 default methods for IdentityHashMap

Patch still active.

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