RFR: 8286460: Remove dependence on JAR filename in CDS tests

[Ioi Lam]

On Tue, 10 May 2022 07:27:35 GMT, Christian Stein <cstein at openjdk.org> wrote:

> Use location information stored in JUnit `Test` class' runtime representation in order to remove a hard-coded dependence on JUnit's JAR filename.

Marked as reviewed by iklam (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/8624