[JITLink] [test] Add a trailing newline to a test file. NFC.

Otherwise, this shows up as an unrelated diff after editing the
file in some editors (like vim).

Author: mstorsjo

llvm/test/ExecutionEngine/JITLink/Generic/all-load-multifile-archive.test

@@ -19,4 +19,4 @@
 #
 # CHECK-DAG: main{{.*}}main.o
 # CHECK-DAG: foo{{.*}}libFoo.a[0](foo.o)
-# CHECK-DAG: bar{{.*}}libFoo.a[1](bar.o)
+# CHECK-DAG: bar{{.*}}libFoo.a[1](bar.o)