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/Program.h

@@ -187,7 +187,7 @@ struct ProcessInfo {
       ///< string is non-empty upon return an error occurred while invoking the
       ///< program.
       );
-  }
-}
+  } // namespace sys
+} // namespace llvm
 
 #endif