tools/jpackage/share/RuntimeImageTest.java fails with -XX:+UseZGC

I'm seeing consistent failures of tools/jpackage/share/RuntimeImageTest.java on Linux x64 fastdebug builds when -XX:+UseZGC is used.

I'm seeing OutOfMemoryErrors when jlink runs:

Error: Java heap space
java.lang.OutOfMemoryError: Java heap space
        at java.base/java.util.Arrays.copyOf(Arrays.java:3540)
        at java.base/java.io.ByteArrayOutputStream.toByteArray(ByteArrayOutputStream.java:187)
        at jdk.jlink/jdk.tools.jlink.internal.plugins.StringSharingPlugin$CompactCPHelper.optimize(StringSharingPlugin.java:258)
        at jdk.jlink/jdk.tools.jlink.internal.plugins.StringSharingPlugin$CompactCPHelper.transform(StringSharingPlugin.java:199)
        at jdk.jlink/jdk.tools.jlink.internal.plugins.StringSharingPlugin.lambda$transform$1(StringSharingPlugin.java:311)
        at jdk.jlink/jdk.tools.jlink.internal.plugins.StringSharingPlugin$$Lambda/0x00007f3153287178.apply(Unknown Source)
        at jdk.jlink/jdk.tools.jlink.plugin.ResourcePool.lambda$transformAndCopy$0(ResourcePool.java:112)
        at jdk.jlink/jdk.tools.jlink.plugin.ResourcePool$$Lambda/0x00007f3153087928.accept(Unknown Source)
        at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
        at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1939)
        at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762)
        at jdk.jlink/jdk.tools.jlink.plugin.ResourcePool.transformAndCopy(ResourcePool.java:111)
        at jdk.jlink/jdk.tools.jlink.internal.plugins.StringSharingPlugin.transform(StringSharingPlugin.java:306)
        at jdk.jlink/jdk.tools.jlink.internal.plugins.DefaultCompressPlugin.transform(DefaultCompressPlugin.java:62)
        at jdk.jlink/jdk.tools.jlink.internal.ImagePluginStack.visitResources(ImagePluginStack.java:262)
        at jdk.jlink/jdk.tools.jlink.internal.ImageFileCreator.generateJImage(ImageFileCreator.java:184)
        at jdk.jlink/jdk.tools.jlink.internal.ImageFileCreator.writeImage(ImageFileCreator.java:163)
        at jdk.jlink/jdk.tools.jlink.internal.ImageFileCreator.create(ImageFileCreator.java:100)
        at jdk.jlink/jdk.tools.jlink.internal.JlinkTask$ImageHelper.retrieve(JlinkTask.java:935)
        at jdk.jlink/jdk.tools.jlink.internal.ImagePluginStack.operate(ImagePluginStack.java:194)
        at jdk.jlink/jdk.tools.jlink.internal.JlinkTask.createImage(JlinkTask.java:424)
        at jdk.jlink/jdk.tools.jlink.internal.JlinkTask.run(JlinkTask.java:285)
        at jdk.jlink/jdk.tools.jlink.internal.Main.run(Main.java:56)
        at jdk.jlink/jdk.tools.jlink.internal.Main$JlinkToolProvider.run(Main.java:73)
        at java.base/java.util.spi.ToolProvider.run(ToolProvider.java:162)
        at jdk.jpackage.test.Executor.runToolProvider(Executor.java:396)
        at jdk.jpackage.test.Executor.runToolProvider(Executor.java:406)
        at jdk.jpackage.test.Executor.lambda$executeWithoutExitCodeCheck$0(Executor.java:212)
        at jdk.jpackage.test.Executor$$Lambda/0x00007f3153012a88.get(Unknown Source)
        at jdk.jpackage.test.Functional$ThrowingSupplier.lambda$toSupplier$0(Functional.java:71)
        at jdk.jpackage.test.Functional$ThrowingSupplier$$Lambda/0x00007f3153012cb8.get(Unknown Source)
        at jdk.jpackage.test.Executor.executeWithoutExitCodeCheck(Executor.java:220)