Fix all the bots.

The buildbot start scripts hardcode the version string.
Bump it from 8 to 9.

llvm-svn: 351638
diff --git a/libcxx/utils/docker/scripts/run_buildbot.sh b/libcxx/utils/docker/scripts/run_buildbot.sh
index 45f5a1c..96e832d 100755
--- a/libcxx/utils/docker/scripts/run_buildbot.sh
+++ b/libcxx/utils/docker/scripts/run_buildbot.sh
@@ -15,9 +15,9 @@
 # FIXME(EricWF): Remove this hack. It's only in place to temporarily fix linking libclang_rt from the
 # debian packages.
 # WARNING: If you're not a buildbot, DO NOT RUN!
-apt-get install lld-8
+apt-get install lld-9
 rm /usr/bin/ld
-ln -s /usr/bin/lld-8 /usr/bin/ld
+ln -s /usr/bin/lld-9 /usr/bin/ld
 
 systemctl set-property buildslave.service TasksMax=100000
 
@@ -59,4 +59,4 @@
 # Gracefully restart before that happen.
 sleep 72000
 while pkill -SIGHUP buildslave; do sleep 5; done;
-shutdown now
\ No newline at end of file
+shutdown now