[yaml2obj][ELF] Ensure more fields are zero'd.

I was spotting garbage in the output. I'd like to just zero the entire
ELFYAML::Section to be sure, but it contains non-POD types. (I'm also
trying to avoid bloating the ELFYAML::Foo classes with a bunch of
constructor code).

No test, since this is by its very nature unpredictable. I'm pretty sure
that one of the sanitizers would catch it immediately though.

llvm-svn: 184160

llvm/tools/yaml2obj/yaml2elf.cpp

@@ -160,6 +160,8 @@ static int writeELF(raw_ostream &OS, const ELFYAML::Object &Doc) {
     ELFYAML::Section S;
     S.Type = SHT_NULL;
     zero(S.Flags);
+    zero(S.Address);
+    zero(S.AddressAlign);
     Sections.insert(Sections.begin(), S);
   }
   // "+ 1" for string table.