AST: Add missing break at end of switch

llvm-svn: 305418
diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index d06bbf5..2300801 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -8547,6 +8547,7 @@
         HowLong = 2;
         break;
       }
+      break;
     }
   }