[jdk21u-dev] RFR: 8327986: ASAN reports use-after-free in DirectivesParserTest.empty_object_vm

[Goetz Lindenmaier]

I backport this for parity with 21.0.7-oracle.

I had to resolve because of NULL/nullptr difference.

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Commit messages:
 - Backport 47f33a59eaaffc74881fcc9e29d13ff9b2538c2a

Changes: https://git.openjdk.org/jdk21u-dev/pull/1356/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1356&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327986
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1356.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1356/head:pull/1356

PR: https://git.openjdk.org/jdk21u-dev/pull/1356