There has been no active use of jdk.vm.ci.hotspot.HotSpotJVMCICompilerFactory.CompilationLevelAdjustment in Graal since March 2019. What's more, JDK-8219403 effectively disabled it. Since HotSpotJVMCICompilerFactory exists solely for CompilationLevelAdjustmen related logic, the whole HotSpotJVMCICompilerFactory class should be removed.