[jdk21u-dev] RFR: 8310913: Move ReferencedKeyMap to jdk.internal so it may be shared

[Aleksey Shipilev]

On Fri, 8 Mar 2024 09:26:11 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Unclean backport to match the codebases between mainline and JDK 21, simplifying maintenance. It also implicitly fixes [JDK-8323505](https://bugs.openjdk.org/browse/JDK-8323505), since this move includes a few touchups to the test.
> 
> The uncleanliness comes from `MethodType.java` conflicts that does not have [JDK-8310849](https://bugs.openjdk.org/browse/JDK-8310849) in JDK 21. So it yields a few contextual conflicts. Since affected hunks are just removals, I removed them by hand.
> 
> There is a follow-up, [JDK-8325255](https://bugs.openjdk.org/browse/JDK-8325255), but it does not seem to affect anything yet, since there are no `ReferenceKeySet.add` calls anywhere in sight. We can backport that separately.
> 
> Additional testing:
>  - [x] MacOS AArch64 Server fastdebug, `jdk/internal/util` tests pass
>  - [x] MacOS AArch64 Server fastdebug, `java/lang/invoke` tests pass
>  - [x] Linux AArch64 Server fastdebug, `all` tests pass

RISC-V GHA failure is environmental.

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

PR Comment: https://git.openjdk.org/jdk21u-dev/pull/342#issuecomment-1997444949