Add back some dead code.

It was there just to avoid warnings. Add a LLVM_ATTRIBUTE_UNUSED
attribute so that it doesn't produce warnings with gcc 6.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@273308 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed