Replace test from using llvm-lto to use llvm-link (NFC)

Some incoming changes in ThinLTO will break this test.
Instead of relying on the heuristic to import, we
force the importing to happen with llvm-link.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290736 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed