[jdk21u-dev] RFR: 8332506: SIGFPE In ObjectSynchronizer::is_async_deflation_needed()

Wed Apr 2 10:39:01 UTC 2025

This is backport of "[JDK-8332506](https://bugs.openjdk.org/browse/JDK-8332506) SIGFPE In ObjectSynchronizer::is_async_deflation_needed()".

This fixes division by zero problem in JDK21 as there are cases the problem occurs in 21.

Backport is almost clean, I resolved a few minor conflicts (copyright, and type conversion differences).

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Commit messages:
 - Backport cbabc0451505a00dfe77c163190736460c53820f

Changes: https://git.openjdk.org/jdk21u-dev/pull/1566/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1566&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332506
  Stats: 45 lines in 1 file changed: 25 ins; 12 del; 8 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1566.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1566/head:pull/1566

PR: https://git.openjdk.org/jdk21u-dev/pull/1566