Moved vector declartion inside state for loop

Code/Framework/AzToolsFramework/Tests/Prefab/Benchmark/SpawnableCreateBenchmarks.cpp

@@ -29,18 +29,19 @@ namespace Benchmark
             {},
             m_pathString));
 
-        // Create a vector to store spawnables so that they don't get destroyed immediately after construction.
-        AZStd::vector<AZStd::unique_ptr<AzFramework::Spawnable>> spawnables;
-        spawnables.reserve(numSpawnables);
 
         auto& prefabDom = m_prefabSystemComponent->FindTemplateDom(instance->GetTemplateId());
         for (auto _ : state)
         {
+            // Create a vector to store spawnables so that they don't get destroyed immediately after construction.
+            AZStd::vector<AZStd::unique_ptr<AzFramework::Spawnable>> spawnables;
+            spawnables.reserve(numSpawnables);
+            
             for (int spwanableCounter = 0; spwanableCounter < numSpawnables; ++spwanableCounter)
             {
                 AZStd::unique_ptr<AzFramework::Spawnable> spawnable = AZStd::make_unique<AzFramework::Spawnable>();
                 AzToolsFramework::Prefab::SpawnableUtils::CreateSpawnable(*spawnable, prefabDom);
-                spawnables[spwanableCounter] = AZStd::move(spawnable);
+                spawnables.push_back(AZStd::move(spawnable));
             }
         }