[ELF] FreeBSD has slightly different emulation strings for PPC.
[ELF] FreeBSD has slightly different emulation strings for PPC.

Teach lld about them.


git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@257437 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld