RFR: 8266851: Implement JEP 403: Strongly Encapsulate JDK Internals [v4]

[Mark Reinhold]

> Please review this implementation of JEP 403 (https://openjdk.java.net/jeps/403).
> Alan Bateman is the original author of almost all of it.  Passes tiers 1-3 on 
> {linux,macos,windows}-x64 and {linux,macos}-aarch64.

Mark Reinhold has updated the pull request incrementally with one additional commit since the last revision:

  Fix up IllegalAccessTest

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4015/files
  - new: https://git.openjdk.java.net/jdk/pull/4015/files/1c14998e..cde0adbb

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4015&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4015&range=02-03

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4015.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4015/head:pull/4015

PR: https://git.openjdk.java.net/jdk/pull/4015