NVPTX: Trivial cleanups of NVPTXInferAddressSpaces
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: 0ff597fd157e6f4fc38580e8d64ab130330d2411@293567 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,apple/swift-llvm,apple/swift-llvm,llvm-mirror/llvm,llvm-mirror/llvm,apple/swift-llvm,apple/swift-llvm,llvm-mirror/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,llvm-mirror/llvm