Bootcycle builds are broken on jdk9/hs due to JVMCI changes.
See the attached log for additional details. Regular builds are fine.

/opt/jprt/T/P1/194453.amurillo/s/hotspot/src/jdk.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotVMConfigVerifier.java:50: error: cannot find symbol
            ClassReader cr = new ClassReader(Objects.requireNonNull(classfile, "Could not find class file for " + cls.getName()));
            ^
  symbol: class ClassReader
  location: class HotSpotVMConfigVerifier
/opt/jprt/T/P1/194453.amurillo/s/hotspot/src/jdk.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotVMConfigVerifier.java:50: error: cannot find symbol
            ClassReader cr = new ClassReader(Objects.requireNonNull(classfile, "Could not find class file for " + cls.getName()));
                                 ^
  symbol: class ClassReader
  location: class HotSpotVMConfigVerifier
/opt/jprt/T/P1/194453.amurillo/s/hotspot/src/jdk.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotVMConfigVerifier.java:51: error: cannot find symbol
            ClassVisitor cv = new HotSpotVMConfigVerifier();
            ^
  symbol: class ClassVisitor
  location: class HotSpotVMConfigVerifier
/opt/jprt/T/P1/194453.amurillo/s/hotspot/src/jdk.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotVMConfigVerifier.java:78: error: cannot find symbol
        super(Opcodes.ASM5);
              ^
  symbol: variable Opcodes
  location: class HotSpotVMConfigVerifier
/opt/jprt/T/P1/194453.amurillo/s/hotspot/src/jdk.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotVMConfigVerifier.java:81: error: method does not override or implement a method from a supertype
    @Override
    ^
/opt/jprt/T/P1/194453.amurillo/s/hotspot/src/jdk.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotVMConfigVerifier.java:99: error: method does not override or implement a method from a supertype
    @Override
    ^
/opt/jprt/T/P1/194453.amurillo/s/hotspot/src/jdk.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotVMConfigVerifier.java:102: error: cannot find symbol
            return new MethodVisitor(Opcodes.ASM5) {
                       ^
  symbol: class MethodVisitor
  location: class HotSpotVMConfigVerifier
/opt/jprt/T/P1/194453.amurillo/s/hotspot/src/jdk.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotVMConfigVerifier.java:102: error: cannot find symbol
            return new MethodVisitor(Opcodes.ASM5) {
                                     ^
  symbol: variable Opcodes
  location: class HotSpotVMConfigVerifier
12 errors
41 warnings
gmake[4]: *** [/opt/jprt/T/P1/194453.amurillo/s/build/linux-x86-normal-clientANDserver-release/bootcycle-build/support/gensrc/jdk.vm.ci/_gensrc_proc_done] Error 1
gmake[4]: Leaving directory `/opt/jprt/T/P1/194453.amurillo/s/hotspot/make/gensrc'
gmake[3]: *** [jdk.vm.ci-gensrc-hotspot] Error 1
gmake[3]: *** Waiting for unfinished jobs....