radv: fix vkUpdateDescriptorSets with inline uniform blocks

descriptorCount is the number of bytes into the descriptor, so
it shouldn't be used as an index. srcArrayElement/dstArrayElement
specify the starting byte offset within the binding to copy from/to.

This fixes new CTS tests:
dEQP-VK.binding_model.descriptor_copy.*.inline_uniform_block_*
dEQP-VK.binding_model.descriptor_copy.*.mix_3
dEQP-VK.binding_model.descriptor_copy.*.mix_array1

Fixes: 8d2654a419 ("radv: Support VK_EXT_inline_uniform_block.")
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/amd/vulkan/radv_descriptor_set.c

@@ -1076,6 +1076,14 @@ void radv_update_descriptor_sets(
 		src_ptr += src_binding_layout->offset / 4;
 		dst_ptr += dst_binding_layout->offset / 4;
 
+		if (src_binding_layout->type == VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT) {
+			src_ptr += copyset->srcArrayElement / 4;
+			dst_ptr += copyset->dstArrayElement / 4;
+
+			memcpy(dst_ptr, src_ptr, copyset->descriptorCount);
+			continue;
+		}
+
 		src_ptr += src_binding_layout->size * copyset->srcArrayElement / 4;
 		dst_ptr += dst_binding_layout->size * copyset->dstArrayElement / 4;