[PECOFF] Do not print @<ordinal> if the symbol is private
[PECOFF] Do not print @<ordinal> if the symbol is private

lib.exe prints a warning if a symbol in a module definition file has
both the PRIVATE attribute and an ordinal like this.

  EXPORTS
    foo @1 PRIVATE

This patch suppresses that.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@218395 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld