[sanitizer] Switch skipped builds to warnings

zorg/buildbot/builders/sanitizers/buildbot_functions.sh

@@ -148,10 +148,12 @@ function buildbot_update {
       git rev-list --pretty --max-count=1 HEAD
       # FIXME: Workaround for https://github.com/llvm/llvm-zorg/issues/250
       [[ "${SKIP_OLD:-1}" == "0" ]] || [[ ! -v BUILDBOT_SCHEDULER ]] || [[ "${BUILDBOT_SCHEDULER}" == "force-build-scheduler" ]] || (git log -1 --after='3 hours ago' | grep .) || {
-        echo Revision is not recent enough
+        echo
+        echo WARNING: Skipping outdated build request...
+        echo
         exit 1
       }
-    ) || { build_exception ; exit 1 ; }
+    ) || { build_warning ; exit 0 ; }
     LLVM=$ROOT/llvm-project/llvm
   fi
 }
@@ -598,6 +600,14 @@ function build_exception() {
   fi
 }
 
+function build_warning() {
+  sleep 5
+  echo "@@@STEP_WARNINGS@@@"
+  if [[ "${BUILDBOT_BISECT_MODE:-}" == "1" || ! -v BUILDBOT_BUILDERNAME ]] ; then
+    exit 2
+  fi
+}
+
 function upload_stats() {
   if [[ "${BUILDBOT_BISECT_MODE:-}" != "1" && -v BUILDBOT_BUILDERNAME ]] ; then
     lscpu > "${ROOT}/cpu.txt"