vk: Minor improvement to descriptor and garbage collector interaction

rpcs3/Emu/RSX/VK/VKGSRender.cpp

@@ -876,6 +876,9 @@ VKGSRender::~VKGSRender()
 		g_fxo->get<vk::AsyncTaskScheduler>().destroy();
 	}
 
+	// GC cleanup
+	vk::get_resource_manager()->flush();
+
 	// Host data
 	if (m_host_object_data)
 	{
@@ -945,7 +948,9 @@ VKGSRender::~VKGSRender()
 	// Overlay text handler
 	m_text_writer.reset();
 
-	//Pipeline descriptors
+	// Pipeline descriptors
+	m_descriptor_pool.destroy();
+
 	vkDestroyPipelineLayout(*m_device, m_pipeline_layout, nullptr);
 	vkDestroyDescriptorSetLayout(*m_device, m_descriptor_layouts, nullptr);
 
@@ -963,9 +968,6 @@ VKGSRender::~VKGSRender()
 	// Global resources
 	vk::destroy_global_resources();
 
-	// Destroy at the end in case of lingering callbacks
-	m_descriptor_pool.destroy();
-
 	// Device handles/contexts
 	m_swapchain->destroy();
 	m_instance.destroy();

rpcs3/Emu/RSX/VK/VKResourceManager.h

@@ -75,6 +75,11 @@ namespace vk
 		~resource_manager() = default;
 
 		void destroy()
+		{
+			flush();
+		}
+
+		void flush()
 		{
 			m_eid_map.clear();
 			m_sampler_pool.clear();