[test] fix failing test, the test was not accounting for - in the path

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@179260 91177308-0d34-0410-b5e6-96231b3b80d8
[test] missing underscore while checking for test output

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@179264 91177308-0d34-0410-b5e6-96231b3b80d8