Pacify gcc's -Wreturn-type

llvm-svn: 150731
diff --git a/clang/lib/AST/ExprCXX.cpp b/clang/lib/AST/ExprCXX.cpp
index 718010b..f52f881 100644
--- a/clang/lib/AST/ExprCXX.cpp
+++ b/clang/lib/AST/ExprCXX.cpp
@@ -120,6 +120,7 @@
   case ListInit:
     return getInitializer()->getSourceRange().getEnd();
   }
+  llvm_unreachable("bogus initialization style");
 }
 
 // CXXDeleteExpr