RFR: JDK-8325148: Enable restricted javac warning in java.base [v3]

[Joe Darcy]

> The restricted javac warning is disabled for java.base, but could be enabled by suppressing the warning in a handful of files.

Joe Darcy has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'master' into JDK-8325148
 - Add comment highlighting restricted method calls.
 - JDK-8325148: Enable restricted javac warning in java.base

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17677/files
  - new: https://git.openjdk.org/jdk/pull/17677/files/9ac261c0..23c93895

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17677&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17677&range=01-02

  Stats: 521 lines in 20 files changed: 317 ins; 95 del; 109 mod
  Patch: https://git.openjdk.org/jdk/pull/17677.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17677/head:pull/17677

PR: https://git.openjdk.org/jdk/pull/17677