[jdk23u] RFR: 8335237: ubsan: vtableStubs.hpp is_vtable_stub exclude from ubsan checks

[Matthias Baesken]

8335237: ubsan: vtableStubs.hpp  is_vtable_stub exclude from ubsan checks

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Commit messages:
 - Backport 486aa11e74d0772ba84c2adc3c62fc1fcbf52604

Changes: https://git.openjdk.org/jdk23u/pull/41/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk23u&pr=41&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8335237
  Stats: 5 lines in 1 file changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk23u/pull/41.diff
  Fetch: git fetch https://git.openjdk.org/jdk23u.git pull/41/head:pull/41

PR: https://git.openjdk.org/jdk23u/pull/41