[ELF] Fix test from r344976
[ELF] Fix test from r344976

Turns out I wasn't actually running this test locally, since I don't
build the PPC and MIPS backends. Whoops.

Perhaps this test should be split up per-architecture?

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@344980 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld