merge-request.sh: Update 8.0 metabug for 8.0.1

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356924 91177308-0d34-0410-b5e6-96231b3b80d8

Author: tstellar

utils/release/merge-request.sh

@@ -101,7 +101,7 @@ case $stable_version in
     release_metabug="39106"
     ;;
   8.0)
-    release_metabug="40331"
+    release_metabug="41221"
     ;;
   *)
     echo "error: invalid stable version"