[ELF] fix atom order

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@178815 91177308-0d34-0410-b5e6-96231b3b80d8
[test] remove printing the file to stdout

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@178817 91177308-0d34-0410-b5e6-96231b3b80d8