Silence a bunch of implicit fallthrough warnings

llvm-svn: 321114
diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
index 0b86041..2a8088d 100644
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -4368,6 +4368,7 @@
       default:
         break;
       }
+    break;
   }
 
   default: