RFR: 8274299: Make Method/Constructor/Field accessors @Stable [v2]

[Mandy Chung]

On Mon, 4 Oct 2021 15:51:18 GMT, Peter Levart <plevart at openjdk.org> wrote:

> One way this could be improved is to "stamp" the modifiers field with an additional bit (say 0x8000_0000) to always hold a non-zero value. Method::getModifiers() would then clear that bit in a returned value to stay compatible. Native Method/Field/Constructor construction would have to be modified too.

Alternatively, it'd become a non-issue when `java.lang.reflect` and `jdk.internal.reflect` are added to the trusted final-field packages.

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