[jdk21u-dev] RFR: 8312246: NPE when HSDB visits bad oop

[Satyen Subramaniam]

Backporting JDK-8312246: NPE when HSDB visits bad oop. Minor HSDB fix: corrects printing "bad oop" with throwing a NPE message to the console when a corrupted object is found. Ran GHA Sanity Checks, local Tier 1 and 2 tests. Patch is clean.

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Commit messages:
 - Backport a7427678e160bf54c57d5bec80650b053dfc9e9a

Changes: https://git.openjdk.org/jdk21u-dev/pull/1738/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1738&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8312246
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1738.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1738/head:pull/1738

PR: https://git.openjdk.org/jdk21u-dev/pull/1738