[jdk16] RFR: 8259757: add a regression test for 8259353 and 8259601

[Igor Ignatyev]

Hi all,

could you please review this small test-only patch which adds a regression test for [8259353](https://bugs.openjdk.java.net/browse/JDK-8259353) and [8259601](https://bugs.openjdk.java.net/browse/JDK-8259353)?

testing:
- [x] `test/hotspot/jtreg/compiler/vectorapi/Test8259353.java` against jdk-16+26 (which doesn't have fixes) : failed, as expected
- [x] `test/hotspot/jtreg/compiler/vectorapi/Test8259353.java` multiple times against jdk-16+32 : passed

Thanks,
-- Igor

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Commit messages:
 - 8259757: add a regression test for 8259353 and 8259601

Changes: https://git.openjdk.java.net/jdk16/pull/120/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16&pr=120&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259757
  Stats: 82 lines in 1 file changed: 82 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk16/pull/120.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16 pull/120/head:pull/120

PR: https://git.openjdk.java.net/jdk16/pull/120