RFR: 8297451: ProcessHandleImpl should assert privilege when modifying reaper thread [v3]

[Alan Bateman]

On Sat, 26 Nov 2022 15:55:27 GMT, Ryan Ernst <duke at openjdk.org> wrote:

>> This commit guards thread modifications for the process reaper thread with doPrivileged.
>
> Ryan Ernst has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Revert factory method

This looks okay. Not important but can eliminate the casts from privilegedThreadSetXXX methods if you separate the creation of the PrivilegedAction from the doPriv call.

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Marked as reviewed by alanb (Reviewer).

PR: https://git.openjdk.org/jdk/pull/11309