Bug ID: JDK-8186299 [Graal] vm/mlvm/anonloader/stress/oome/heap fails with OOM in Metaspace

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vm/mlvm/anonloader/stress/oome/heap fails 

java.lang.OutOfMemoryError: Metaspace
[2017-08-14T08:54:30.30] 	at jdk.internal.vm.compiler@10-internal/org.graalvm.compiler.debug.DebugOptions.getDumpDirectory(DebugOptions.java:199)
[2017-08-14T08:54:30.30] 	at jdk.internal.vm.compiler@10-internal/org.graalvm.compiler.debug.DiagnosticsOutputDirectory.createPath(DiagnosticsOutputDirectory.java:117)
[2017-08-14T08:54:30.30] 	at jdk.internal.vm.compiler@10-internal/org.graalvm.compiler.debug.DiagnosticsOutputDirectory.getPath(DiagnosticsOutputDirectory.java:94)
[2017-08-14T08:54:30.30] 	at jdk.internal.vm.compiler@10-internal/org.graalvm.compiler.debug.DiagnosticsOutputDirectory.getPath(DiagnosticsOutputDirectory.java:69)
[2017-08-14T08:54:30.30] 	at jdk.internal.vm.compiler@10-internal/org.graalvm.compiler.core.CompilationWrapper.run(CompilationWrapper.java:238)
[2017-08-14T08:54:30.30] 	at jdk.internal.vm.compiler@10-internal/org.graalvm.compiler.hotspot.CompilationTask.runCompilation(CompilationTask.java:317)
[2017-08-14T08:54:30.30] 	at jdk.internal.vm.compiler@10-internal/org.graalvm.compiler.hotspot.HotSpotGraalCompiler.compileMethod(HotSpotGraalCompiler.java:142)
[2017-08-14T08:54:30.30] 	at jdk.internal.vm.compiler@10-internal/org.graalvm.compiler.hotspot.HotSpotGraalCompiler.compileMethod(HotSpotGraalCompiler.java:108)
[2017-08-14T08:54:30.30] 	at jdk.internal.vm.ci/jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.compileMethod(HotSpotJVMCIRuntime.java:433)