ELF: Simplify. NFCI.
ELF: Simplify. NFCI.

We don't need to take a slice of SectionCommands in addOrphanSections()
because it is not modified until the end of the function.

Differential Revision: https://reviews.llvm.org/D59239

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@355954 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld