RFR: 8348117: The two-argument overload of SignatureHandlerLibrary::add is not used

[Aleksey Shipilev]

On Tue, 21 Jan 2025 08:44:56 GMT, David Holmes <dholmes at openjdk.org> wrote:

> The  `SignatureHandlerLibrary::add` two-arg API was added to support closed code under [JDK-8087333](https://bugs.openjdk.org/browse/JDK-8087333) in JDK 9. That closed code was removed again, still in JDK 9, as part of JEP 297 ([JDK-8168503](https://bugs.openjdk.org/browse/JDK-8168503)) which unified the closed and open ARM ports - leaving the API unused.
> 
> There were other leftovers from the same set of changes so they are cleaned up as well - nothing significant, just unnecessary friend declarations, comments, and one other method.
> 
> Testing:
>  - all builds in tiers 1-5
> 
> Thanks.

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/23207#pullrequestreview-2564926201