Fix potential double-free.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@51381 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/Stmt.cpp b/lib/AST/Stmt.cpp
index b12518f..6d8ebcf 100644
--- a/lib/AST/Stmt.cpp
+++ b/lib/AST/Stmt.cpp
@@ -57,7 +57,7 @@
 
 void DeclStmt::Destroy(ASTContext& C) {
   TheDecl->Destroy(C);
-  Stmt::Destroy(C);
+  delete this;
 }
 
 void Stmt::PrintStats() {