[ThinLTO/tests] Check we don't fail if --thinlto-jobs is not passed.
[ThinLTO/tests] Check we don't fail if --thinlto-jobs is not passed.

While here, fix the CHECK lines of an existing test.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@283889 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld