[Renaming] Improve performance of RenamePropertyRector (#3698)

* [Renaming] Improve performance of RenamePropertyRector

* early null assign

* [ci-review] Rector Rectify

---------

Co-authored-by: GitHub Action <actions@github.com>

rules/Renaming/Rector/PropertyFetch/RenamePropertyRector.php

@@ -4,6 +4,7 @@
 
 namespace Rector\Renaming\Rector\PropertyFetch;
 
+use PHPStan\Type\Type;
 use PhpParser\Node;
 use PhpParser\Node\Expr\PropertyFetch;
 use PhpParser\Node\Identifier;
@@ -113,6 +114,7 @@ private function renameProperty(ClassLike $classLike, RenameProperty $renameProp
     private function processFromPropertyFetch(PropertyFetch $propertyFetch): ?PropertyFetch
     {
         $class = $this->betterNodeFinder->findParentType($propertyFetch, Class_::class);
+        $nodeVarType = null;
 
         foreach ($this->renamedProperties as $renamedProperty) {
             $oldProperty = $renamedProperty->getOldProperty();
@@ -123,8 +125,11 @@ private function processFromPropertyFetch(PropertyFetch $propertyFetch): ?Proper
             if (! $this->isObjectType($propertyFetch->var, $renamedProperty->getObjectType())) {
                 continue;
             }
+
+            if (! $nodeVarType instanceof Type) {
+                $nodeVarType = $this->nodeTypeResolver->getType($propertyFetch->var);
+            }
 
-            $nodeVarType = $this->nodeTypeResolver->getType($propertyFetch->var);
             if ($nodeVarType instanceof ThisType && $class instanceof ClassLike) {
                 $this->renameProperty($class, $renamedProperty);
             }