Revert r364999: [lld] Use -o /dev/null in test when output is not needed.
Revert r364999: [lld] Use -o /dev/null in test when output is not needed.

This reverts commit r364999 as it broke a build. Looks like `%t.archive.o`
is used two lines below where it was created.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@365001 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld