radv: advertise VK_AMD_shader_fragment_mask

Only for GFX8+ because it's untested on older generations.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3304>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3304>
diff --git a/src/amd/vulkan/radv_shader.c b/src/amd/vulkan/radv_shader.c
index bbf5cd7..e407c91 100644
--- a/src/amd/vulkan/radv_shader.c
+++ b/src/amd/vulkan/radv_shader.c
@@ -361,6 +361,7 @@
 		const struct spirv_to_nir_options spirv_options = {
 			.lower_ubo_ssbo_access_to_offsets = true,
 			.caps = {
+				.amd_fragment_mask = true,
 				.amd_gcn_shader = true,
 				.amd_image_read_write_lod = true,
 				.amd_shader_ballot = device->physical_device->use_shader_ballot,