Fix inconsistent analysis on case-insensitive filesystems

Author: staabm

e2e/bug-12972/autoloader.php

@@ -0,0 +1,7 @@
+<?php
+
+spl_autoload_register(function($class) {
+	if ($class === 'other\MyClass') {
+		require_once __DIR__ . '/src/OTHER/file.php'; // wrong case sensitivity on purpose
+	}
+});

e2e/bug-12972/phpstan.dist.neon

@@ -0,0 +1,8 @@
+parameters:
+    level: 9
+
+    paths:
+        - src
+
+    bootstrapFiles:
+        - autoloader.php

e2e/bug-12972/src/folder/file2.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Foo12972;
+
+use other\MyClass;
+
+function doBar(MyClass $myClass):void {}

e2e/bug-12972/src/other/file.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace other12972;
+
+class MyClass {
+	public function doSomething(): int
+	{
+		return 1;
+	}
+}