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

[Ryan Ernst]

On Sat, 26 Nov 2022 17:24:02 GMT, Alan Bateman <alanb at openjdk.org> wrote:

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

I chose to keep it as is since there was already another doPriv in the file that uses the cast style.

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