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!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240137 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/Errc.h

@@ -78,7 +78,7 @@ enum class errc {
 inline std::error_code make_error_code(errc E) {
   return std::error_code(static_cast<int>(E), std::generic_category());
 }
-}
+} // namespace llvm
 
 namespace std {
 template <> struct is_error_code_enum<llvm::errc> : std::true_type {};