git: openjdk/jdk16: 8259757: add a regression test for 8259353 and 8259601

[Igor Ignatyev]

Changeset: 0408b23b
Author:    Igor Ignatyev <iignatyev at openjdk.org>
Date:      2021-01-20 18:48:10 +0000
URL:       https://git.openjdk.java.net/jdk16/commit/0408b23b

8259757: add a regression test for 8259353 and 8259601

Co-authored-by: Xiaohong Gong <xgong at openjdk.org>
Co-authored-by: Igor Ignatyev <iignatyev at openjdk.org>
Reviewed-by: kvn, jiefu

+ test/hotspot/jtreg/compiler/vectorapi/Test8259353.java