RFR: 8319204: G1: Change G1CMTask::_termination_time_ms to wallclock time

Wed Nov 1 09:34:29 UTC 2023

Simple switching from thread-cpu to wall-clock time for termination duration metric.

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

Commit messages:
 - g1-termination-time

Changes: https://git.openjdk.org/jdk/pull/16446/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16446&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319204
  Stats: 8 lines in 2 files changed: 0 ins; 6 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16446.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16446/head:pull/16446

PR: https://git.openjdk.org/jdk/pull/16446