Looks like the fix for subtask JDK-8145544 missed some classes in the hotspot repo
and so the build is broken when merging jdk9/dev with jdk9/hs:

=== Output from failing command(s) repeated here ===
/usr/bin/printf "* For target jdk.vm.ci:\n"
* For target jdk.vm.ci:
/bin/cat /opt/jprt/T/P1/022206.amurillo/s/build/macosx-x86_64-normal-server-fastdebug/make-support/failure-logs/jdk.vm.ci.log | /usr/bin/grep -v -e "^Note: including file:"
/opt/jprt/T/P1/022206.amurillo/s/hotspot/src/jdk.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotJVMCIRuntime.java:52: error: cannot find symbol
import sun.misc.VM;
               ^
  symbol: class VM
  location: package sun.misc
/opt/jprt/T/P1/022206.amurillo/s/hotspot/src/jdk.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotJVMCIRuntime.java:96: error: cannot find symbol
        String value = VM.getSavedProperty("jvmci." + name);
                       ^
  symbol: variable VM
  location: class HotSpotJVMCIRuntime
2 errors
/usr/bin/printf "=== End of repeated output ===\n"

We need this fixed ASAP as this is preventing the creation of jdk9/hs snapshots for integrating into jdk9/dev (we run PIT over the weekend)