[ELF] - Fix build bot after rL327612.
[ELF] - Fix build bot after rL327612.

Error was: 
error: field 'Size' will be initialized after field 'CommandString' [-Werror,-Wreorder]

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@327613 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld