[perf] Hoist cheap limit-arg guard before scope fetch in preg_split rule (#8709)

Author: TomasVotruba

rules/Php81/Rector/FuncCall/NullToStrictIntPregSlitFuncCallLimitArgRector.php

@@ -80,18 +80,18 @@ public function refactor(Node $node): ?Node
             return null;
         }
 
-        $scope = $node->getAttribute(AttributeKey::SCOPE);
-        if (! $scope instanceof Scope) {
-            return null;
-        }
-
         $args = $node->getArgs();
         $position = $this->argsAnalyzer->resolveArgPosition($args, 'limit', 2);
 
         if (! isset($args[$position])) {
             return null;
         }
 
+        $scope = $node->getAttribute(AttributeKey::SCOPE);
+        if (! $scope instanceof Scope) {
+            return null;
+        }
+
         $classReflection = $scope->getClassReflection();
         $isTrait = $classReflection instanceof ClassReflection && $classReflection->isTrait();