git: openjdk/jdk17u: master: 8270110: Shenandoah: Add test for JDK-8269661

[Aleksey Shipilev]

Changeset: d561554f
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2021-09-09 07:57:56 +0000
URL:       https://git.openjdk.java.net/jdk17u/commit/d561554fdfd9a00b4e9a4a02f0f5d819fca3ac54

8270110: Shenandoah: Add test for JDK-8269661

Backport-of: 548bb3119cf792bb1e65e15e990a4addc9155312

! src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
+ test/hotspot/jtreg/gc/shenandoah/jni/TestStringCriticalWithDedup.java
+ test/hotspot/jtreg/gc/shenandoah/jni/libTestStringCriticalWithDedup.c