When we combine UseEpsilonGC with EnableJVMCI or UseJVMCICompiler,
HotSpot will give up JVMCI over EpsilonGC. This block users from using Graal.

$java -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -XX:+EnableJVMCI -version

[0.001s][warning][gc,jvmci] Setting EnableJVMCI to false as selected GC does not support JVMCI: epsilon gc

I don't think EpsilonGC require anything from JIT compilers.