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

[Ryan Ernst]

> 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

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11309/files
  - new: https://git.openjdk.org/jdk/pull/11309/files/a822cc8e..bc42d415

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11309&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11309&range=01-02

  Stats: 29 lines in 2 files changed: 9 ins; 12 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/11309.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11309/head:pull/11309

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