Fixed/added namespace ending comments using clang-tidy. NFC

The patch is generated using this command:

tools/clang/tools/extra/clang-tidy/tool/run-clang-tidy.py -fix \
  -checks=-*,llvm-namespace-comment -header-filter='llvm/.*|clang/.*' \
  llvm/lib/


Thanks to Eugene Kosov for the original patch!

llvm-svn: 240137
diff --git a/llvm/lib/Target/NVPTX/NVPTXMachineFunctionInfo.h b/llvm/lib/Target/NVPTX/NVPTXMachineFunctionInfo.h
index 10f1135..4b9322c 100644
--- a/llvm/lib/Target/NVPTX/NVPTXMachineFunctionInfo.h
+++ b/llvm/lib/Target/NVPTX/NVPTXMachineFunctionInfo.h
@@ -46,6 +46,6 @@
     return ImageHandleList[Idx].c_str();
   }
 };
-}
+} // namespace llvm
 
 #endif