[ELF] - Simplify. NFCI.
[ELF] - Simplify. NFCI.

It does not look possible to end up with empty Sections
at this place. And this knowledge allows simplifying the code.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@336814 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld