RFR: 8296492: Remove ObjectLocker in JVMTI get_subgroups call [v4]

Tue Nov 8 14:47:59 UTC 2022

> The JVM code took a ThreadGroup lock before poking into ThreadGroup fields.  Call a method in the ThreadGroup to call the synchronized method instead.
> Tested with tier 1-4.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Clean up extra copy

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/11033/files
  - new: https://git.openjdk.org/jdk/pull/11033/files/120bee6b..89955d30

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11033&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11033&range=02-03

  Stats: 40 lines in 3 files changed: 10 ins; 20 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/11033.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11033/head:pull/11033

PR: https://git.openjdk.org/jdk/pull/11033