0003-use-built-in-xz-compression.patch

--- a/test-release.sh
+++ b/test-release.sh
@@ -631,7 +631,7 @@ function package_release() {
     if [ "$use_gzip" = "yes" ]; then
       tar cf - $Package | gzip -9c > $BuildDir/$Package.tar.gz
     else
-      tar cf - $Package | xz -9ce -T $NumJobs > $BuildDir/$Package.tar.xz
+      tar -c -J --options 'compression-level=9' -f $BuildDir/$Package.tar.xz $Package
     fi
     mv $Package llvmCore-$Release-$RC.install/usr/local
     cd $cwd