[clang-format][NFC] Rewrite prints in python3 compatible way

[eoanermine]

Summary

Closes https://github.com/llvm/llvm-project/issues/55996

[HazardyKnusperkeks]

Maybe add the [NFC] tag.

[eoanermine]

Please, commit this patch for me

I don't have an access to commit the patch by myself.

clang-tools-extra/clang-include-fixer/find-all-symbols/tool/run-find-all-symbols.py

 import threading
 
 
 def find_compilation_database(path):
   """Adjusts the directory until a compilation database is found."""
   result = './'
   while not os.path.isfile(os.path.join(result, path)):
     if os.path.realpath(result) == '/':
-      print 'Error: could not find compilation database.'
+      print('Error: could not find compilation database.')
       sys.exit(1)
     result += '../'
   return os.path.realpath(result)
 
 
 def MergeSymbols(directory, args):
   """Merge all symbol files (yaml) in a given directory into a single file."""
   invocation = [args.binary, '-merge-dir='+directory, args.saving_path]
   subprocess.call(invocation)
-  print 'Merge is finished. Saving results in ' + args.saving_path
+  print('Merge is finished. Saving results in ' + args.saving_path)
 
 
 def run_find_all_symbols(args, tmpdir, build_path, queue):
   """Takes filenames out of queue and runs find-all-symbols on them."""
   while True:
     name = queue.get()
     invocation = [args.binary, name, '-output-dir='+tmpdir, '-p='+build_path]
     sys.stdout.write(' '.join(invocation) + '\n')
try:
     queue.join()
 
     MergeSymbols(tmpdir, args)
 
 
   except KeyboardInterrupt:
     # This is a sad hack. Unfortunately subprocess goes
     # bonkers with ctrl-c and we start forking merrily.
-    print '\nCtrl-C detected, goodbye.'
+    print('\nCtrl-C detected, goodbye.')
     os.kill(0, 9)
 
 
 if __name__ == '__main__':
   main()