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

The patch is generated using this command:

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

To reduce churn, not touching namespaces spanning less than 10 lines.

llvm-svn: 240270

clang/lib/CodeGen/CodeGenModule.cpp

@@ -1435,7 +1435,7 @@ namespace {
       return true;
     }
   };
-}
+} // namespace
 
 // isTriviallyRecursive - Check if this function calls another
 // decl that, because of the asm attribute or the other decl being a builtin,