COFF: Fix command line options for external commands.
COFF: Fix command line options for external commands.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@241853 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld