JDK-8264806 (Remove Graal from JDK) changes did not remove two Graal-related module-info.java files so that the JVMCI module (jdk.internal.vm.ci, JEP 243) continues to build:
src/jdk.internal.vm.compiler/share/classes/module-info.java
src/jdk.internal.vm.compiler.management/share/classes/module-info.java

Alan Bateman suggested that we can remove these files by using Module API to export packages at runtime. It requires changes in GraalVM's upstream JVMCI too so this followup RFE is filed.