RFR: 8274299: Make Method/Constructor/Field accessors @Stable [v3]

[Peter Levart]

> 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.

Peter Levart has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR.

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5694/files
  - new: https://git.openjdk.java.net/jdk/pull/5694/files/1f273e9a..0298253e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5694&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5694&range=01-02

  Stats: 28 lines in 3 files changed: 0 ins; 0 del; 28 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5694.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5694/head:pull/5694

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