[yaml2obj][ELF] Allow symbols to reference sections.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184468 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Object/ELFYAML.cpp b/lib/Object/ELFYAML.cpp
index 5692f4b..39faf7d 100644
--- a/lib/Object/ELFYAML.cpp
+++ b/lib/Object/ELFYAML.cpp
@@ -315,6 +315,7 @@
   IO.mapOptional("Name", Symbol.Name, StringRef());
   IO.mapOptional("Binding", Symbol.Binding, ELFYAML::ELF_STB(0));
   IO.mapOptional("Type", Symbol.Type, ELFYAML::ELF_STT(0));
+  IO.mapOptional("Section", Symbol.Section, StringRef());
 }
 
 void MappingTraits<ELFYAML::Section>::mapping(IO &IO,