$ jtreg "-vmoptions:-XX:MaxRAMPercentage=12 -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+TieredCompilation -XX:+UseJVMCICompiler -Djvmci.Compiler=graal" TestZGCWithCDS.java

----------System.err:(22/1081)----------
 stdout: [Error occurred during initialization of VM
JVMCI Compiler does not support selected GC: z gc
];