[ELF2/AArch64] Add comment and change name to match the one of the ABI.
[ELF2/AArch64] Add comment and change name to match the one of the ABI.

Fix style while I'm here.


git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@249198 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld