[PECOFF] Remove special treatment of "--" option.
[PECOFF] Remove special treatment of "--" option.

Thanks to Hans' patch (r187675), OptTable now handles "--", so we don't
need this code in LLD.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@187683 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld