[jdk21u-dev] RFR: 8308633: Increase precision of timestamps in g1 log

[Daniel Hu]

temp

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

Commit messages:
 - Backport c23794f88270c121bf99fdf297fdfde53072e3b6

Changes: https://git.openjdk.org/jdk21u-dev/pull/1919/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1919&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308633
  Stats: 13 lines in 4 files changed: 3 ins; 0 del; 10 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1919.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1919/head:pull/1919

PR: https://git.openjdk.org/jdk21u-dev/pull/1919