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

[Mandy Chung]

On Mon, 27 Sep 2021 11:23:43 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> A stray thought is why not most fields in `Field`/`Method`/`Constructor` are `final`, as my IDE suggests. I can't find any hotspot code that injects values to these fields. Experimentally changing most fields in `Field` to final seem to pass at least all the java/lang/reflect tests. Since this is a trusted package `@Stable` should then be pointless.

This is a good observation.  I took another look.    The only place to set those fields are in `Reflection:new_field/new_method/new_constructor`.    Making the fields that set by the Method/Field/Constructor constructor be final is a good idea!  Those final fields don't need to be `@Stable`.   

One thing I'm puzzling is why the performance result is better but `java.lang.reflect` is not in the TNSFF package list.

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