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

llvm/lib/CodeGen/MachineFunctionPrinterPass.cpp

@@ -49,7 +49,7 @@ struct MachineFunctionPrinterPass : public MachineFunctionPass {
 };
 
 char MachineFunctionPrinterPass::ID = 0;
-}
+} // namespace
 
 char &llvm::MachineFunctionPrinterPassID = MachineFunctionPrinterPass::ID;
 INITIALIZE_PASS(MachineFunctionPrinterPass, "machineinstr-printer",