RFR: 8300644: Remove gc/shenandoah/jni/TestStringCriticalWithDedup.java

[William Kemper]

On Thu, 19 Jan 2023 10:26:38 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

> The gc/shenandoah/jni/TestStringCriticalWithDedup.java test was designed to catch failure to pin strings being passed out to JNI critical users, because that used to be dangerous. After [JDK-8299673](https://bugs.openjdk.org/browse/JDK-8299673) that is not dangerous any longer. Conversely, now we kind of want deduplication to proceed regardless of JNI critical, which defeats the purpose of this test. It should be removed.

Looks like it will also be safe to delete `libTestStringCriticalWithDedup.c`.

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Changes requested by wkemper (no project role).

PR: https://git.openjdk.org/jdk/pull/12089