RFR: JDK-8325148: Enable restricted javac warning in java.base [v2]

[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 incrementally with one additional commit since the last revision:

  Add comment highlighting restricted method calls.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17677/files
  - new: https://git.openjdk.org/jdk/pull/17677/files/4973b1fb..9ac261c0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17677&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17677&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 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