Fix fatal error when autoloader open directories

[staabm]

before this fix running the reproducer in phpstan/phpstan#8611 resulted in

refs phpstan/phpstan#8610

$ php bin/phpstan analyze ../phpstan/e2e/bug8610/ -c ../phpstan/e2e/bug8610/phpstan.neon 
 3/3 [============================] 100%

 -- -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 
     Error
 -- --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
     Internal error: Internal error: RecursiveDirectoryIterator::__construct(C:\dvl\Workspace\phpstan\e2e\bug8610/classes): Failed to open directory:
     "PHPStan\Reflection\BetterReflection\SourceLocator\FileReadTrapStreamWrapper::dir_opendir" call failed in file C:\dvl\Workspace\phpstan\e2e\bug8610\trigger-autoload.php
     Run PHPStan with -v option and post the stack trace to:
     https://github.com/phpstan/phpstan/issues/new?template=Bug_report.md
     Child process error (exit code 1):
 -- --------------------------------------------------------------------------------------------------------------------------------------------------------------------------


                                                                                                                        
 [ERROR] Found 2 errors                                                                                                                                                                                                                      

after this fix I get

$ php bin/phpstan analyze ../phpstan/e2e/bug8610/ -c ../phpstan/e2e/bug8610/phpstan.neon 
 3/3 [============================] 100%

 ------ --------------------------------------------------------------------- 
  Line   phpstan\e2e\bug8610\trigger-autoload.php                             
 ------ --------------------------------------------------------------------- 
  5      Instantiated class DoesNotExist not found.                           
         💡 Learn more at https://phpstan.org/user-guide/discovering-symbols  
 ------ --------------------------------------------------------------------- 


                                                                                                                        
 [ERROR] Found 1 error                                                                                                                                                                                                                         

since I am not able to reproduce the actual reported issue locally, thats more of a educated guess then a properly tested fix.

wdyt? or is it required to actually read the dir etc.?

[phpstan-bot]

This pull request has been marked as ready for review.

[ondrejmirtes]

Re-run the build and you'll see if it's green. You can for example amend the last commit to change its hash.

[staabm]

we are getting the expected error (an no longer a fatal internal errors). what is missing is, that this new error is considered a success :-)

[ondrejmirtes]

Should be a baseline - ignored error matched -> success

[ondrejmirtes]

Thank you. Please verify with phpstan/phpstan 1.9.x-dev that your issue is gone.

[staabm]

running on 1.9.x-dev finishes as expected. thank you.