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

[Per Minborg]

On Thu, 1 Feb 2024 22:19:26 GMT, Joe Darcy <darcy at openjdk.org> wrote:

>> 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.

Nice fix. Thanks.

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Marked as reviewed by pminborg (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/17677#pullrequestreview-1858547285