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

lib/Bitcode/Writer/BitcodeWriterPass.cpp

@@ -41,7 +41,7 @@ namespace {
       return false;
     }
   };
-}
+} // namespace
 
 char WriteBitcodePass::ID = 0;