RFR: 8256299: Implement JEP 396: Strongly Encapsulate JDK Internals by Default [v2]

[Mark Reinhold]

> Please review this implementation of JEP 396 (https://openjdk.java.net/jeps/396).
> Alan Bateman is the original author; I’ve credited him in the commit metadata.
> Passes tiers 1-3 on {linux,macos,windows}-x64 and linux-aarch64.

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

  Remove unnecessary @module :open from ASN1FormatterTest.java

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1324/files
  - new: https://git.openjdk.java.net/jdk/pull/1324/files/4c0e8887..baf34a19

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1324&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1324&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1324.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1324/head:pull/1324

PR: https://git.openjdk.java.net/jdk/pull/1324