[ELF2/AArch64] Comment R_AARCH64_ADD_ABS_LO12_NC relocation.
[ELF2/AArch64] Comment R_AARCH64_ADD_ABS_LO12_NC relocation.

Differential Revision:	 http://reviews.llvm.org/D13832


git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@250551 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld