RFR: 8274299: Make Method/Constructor/Field accessors @Stable

[Mandy Chung]

On Sat, 25 Sep 2021 10:15:11 GMT, Peter Levart <plevart at openjdk.org> wrote:

> This patch improves reflective access speed as shown by the included benchmarks:
> 
> https://jmh.morethan.io/?gists=902f4b43519c4f96c7abcd14cdc2d27d,ac490481e3001c710d75d6071c10b23a
> 
> ... and is also a prerequisite to make JEP 416 (Reimplement Core Reflection with Method Handle) perform better in some circumstances.

Looks good to me.   Very nice performance improvement.

One minor comment: I think the change in `UnsafeFieldAccessorImpl.java` and `UnsafeStaticFieldAccessorImpl.java` isn't necessary since they're final fields.

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Marked as reviewed by mchung (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/5694