Appease -Wnon-virtual-dtor

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@162700 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/AST/Stmt.h b/include/clang/AST/Stmt.h
index 1f58a97..74bd169 100644
--- a/include/clang/AST/Stmt.h
+++ b/include/clang/AST/Stmt.h
@@ -1393,6 +1393,8 @@
   explicit AsmStmt(StmtClass SC, EmptyShell Empty) :
     Stmt(SC, Empty), Names(0), Exprs(0) { }
 
+  virtual ~AsmStmt() { }
+
   SourceLocation getAsmLoc() const { return AsmLoc; }
   void setAsmLoc(SourceLocation L) { AsmLoc = L; }