[jdk24u] RFR: 8352512: TestVectorZeroCount: counter not reset between iterations

[Martin Doerr]

Clean backport of [JDK-8352512](https://bugs.openjdk.org/browse/JDK-8352512).

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Commit messages:
 - Backport 1c0fa0af7847d80fd3fbe38f28207aab270609b3

Changes: https://git.openjdk.org/jdk24u/pull/153/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk24u&pr=153&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8352512
  Stats: 11 lines in 1 file changed: 7 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk24u/pull/153.diff
  Fetch: git fetch https://git.openjdk.org/jdk24u.git pull/153/head:pull/153

PR: https://git.openjdk.org/jdk24u/pull/153