git: openjdk/jdk20: 8298919: Add a regression test for JDK-8298520

[Tobias Hartmann]

Changeset: 9e10f00e
Author:    Tobias Hartmann <thartmann at openjdk.org>
Date:      2022-12-16 14:39:48 +0000
URL:       https://git.openjdk.org/jdk20/commit/9e10f00edbf37e5e5db8efc4f1e0c2a76541aab2

8298919: Add a regression test for JDK-8298520

Reviewed-by: chagedorn, roland

+ test/hotspot/jtreg/compiler/loopopts/TestUnexpectedOpaque1.java