wsi/common: Add comment about DEFERRED_ALLOCATION_BIT_EXT.

Signed-off-by: Hans-Kristian Arntzen <post@arntzen-software.no>
Reviewed-by: Joshua Ashton <joshua@froggi.es>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20235>

src/vulkan/wsi/wsi_common.c

@@ -914,6 +914,10 @@ wsi_CreateSwapchainKHR(VkDevice _device,
    else
      alloc = &device->alloc;
 
+   /* Ignore DEFERRED_MEMORY_ALLOCATION_BIT. Would require deep plumbing to be able to take advantage of it.
+    * bool deferred_allocation = pCreateInfo->flags & VK_SWAPCHAIN_CREATE_DEFERRED_MEMORY_ALLOCATION_BIT_EXT;
+    */
+
    VkResult result = iface->create_swapchain(surface, _device, wsi_device,
                                              pCreateInfo, alloc,
                                              &swapchain);