[yaml2obj][ELF] Add a virtual destructor to the ELFYAML::Section class

to prevent memory leaks.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206969 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Object/ELFYAML.cpp

@@ -14,6 +14,9 @@
 #include "llvm/Object/ELFYAML.h"
 
 namespace llvm {
+
+ELFYAML::Section ::~Section() {}
+
 namespace yaml {
 
 void