[Mips] Remove unused test input file.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@212927 91177308-0d34-0410-b5e6-96231b3b80d8
[Mips] Delete the empty directory.


git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@212928 91177308-0d34-0410-b5e6-96231b3b80d8