Revert "Run bootstrap-registered autoloaders inside the file-read trap (#6185)"

This reverts commit 8e2efc0, keeping
the bug-14988 e2e test. Its workflow step is commented out - without
the reverted fix, a bootstrap autoloader re-includes an already loaded
file and the child process dies with a redeclare fatal again.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NHfXXuWi9gKZ8daM2CeAyS

Author: ondrejmirtes

.github/workflows/e2e-tests.yml

@@ -128,12 +128,12 @@ jobs:
               cd e2e/bug-14514
               composer install
               ../../bin/phpstan analyze bug-14515.php
-          - script: |
-              cd e2e/bug-14988
-              composer install
-              ../../bin/phpstan analyse
           # Fails since the revert of the bootstrap autoloader changes:
           # - script: |
+          #     cd e2e/bug-14988
+          #     composer install
+          #     ../../bin/phpstan analyse
+          # - script: |
           #     cd e2e/bug-12972b
           #     composer install
           #     ../../bin/phpstan analyze

src/Reflection/BetterReflection/SourceLocator/AutoloadFunctionsSourceLocator.php

@@ -9,7 +9,6 @@
 use PHPStan\BetterReflection\Reflector\Reflector;
 use PHPStan\BetterReflection\SourceLocator\Type\SourceLocator;
 use function class_exists;
-use function function_exists;
 use function interface_exists;
 use function PHPStan\autoloadFunctions;
 use function trait_exists;
@@ -36,18 +35,6 @@ public function locateIdentifier(Reflector $reflector, Identifier $identifier):
 			return null;
 		}
 
-		// If the name is already a defined function, this locator must not run the bootstrap
-		// autoloaders for it: a catch-all autoloader (e.g. PHP_CodeSniffer's, which falls back to
-		// Composer's findFile()) would resolve the name to the function's own file and plain-include
-		// it a second time - it was loaded once already, e.g. by a package that ships one function
-		// per PSR-4 path and requires it from its bootstrap - fatally redeclaring the function.
-		// Returning null only declines this locator; a class and a function may share a name in PHP,
-		// and a class that genuinely exists under this name in another file is still located by the
-		// later source locators in the chain. See https://github.com/phpstan/phpstan/issues/14988
-		if (function_exists($className)) {
-			return null;
-		}
-
 		$autoloadFunctions = autoloadFunctions();
 		foreach ($autoloadFunctions as $autoloadFunction) {
 			$autoloadFunction($className);