[ELF][MIPS] Replace S and A arguments of the writeMipsHi16 function by the single argument V. NFC
[ELF][MIPS] Replace S and A arguments of the writeMipsHi16 function by the single argument V. NFC

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@262704 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld