nvk expose EXT_shader_demote_to_helper_invocation

Signed-off-by: Yusuf Khan <yusisamerican@gmail.com>

src/nouveau/vulkan/nvk_physical_device.c

@@ -402,6 +402,7 @@ nvk_get_device_extensions(const struct nvk_physical_device *pdev,
       .EXT_pci_bus_info = true,
       .EXT_private_data = true,
       .EXT_sample_locations = pdev->info.cls_eng3d >= MAXWELL_B,
+      .EXT_shader_demote_to_helper_invocation = true,
       .EXT_vertex_input_dynamic_state = true,
    };
 }

src/nouveau/vulkan/nvk_shader.c

@@ -60,6 +60,7 @@ nvk_physical_device_spirv_options(const struct nvk_physical_device *pdevice,
 {
    return (struct spirv_to_nir_options) {
       .caps = {
+         .demote_to_helper_invocation = true,
          .image_write_without_format = true,
          .physical_storage_buffer_address = true,
       },