RFR: 8353692: Relax memory constraint on updating ObjectMonitorTable's item count

[Zhengyu Gu]

It is a simple atomic counter for calculating hash table's load factor, only needs atomic guarantee.

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Commit messages:
 - 8353692: Relax memory constraint on updating ObjectMonitorTable's item count

Changes: https://git.openjdk.org/jdk/pull/24432/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24432&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353692
  Stats: 4 lines in 1 file changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/24432.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24432/head:pull/24432

PR: https://git.openjdk.org/jdk/pull/24432