NVPTX: Trivial cleanups of NVPTXInferAddressSpaces

- Move DEBUG_TYPE below includes
- Change unknown address space constant to be consistent with other
  passes
- Grammar fixes in debug output

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293567 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed