anv/pass: Store subpass attachment reference list

We'll loop through this array when performing automatic layout
transitions.

v2: Adjust formatting of an assignment (Jason Ekstrand)

Signed-off-by: Nanley Chery <nanley.g.chery@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

src/intel/vulkan/anv_private.h

@@ -1921,6 +1921,13 @@ struct anv_framebuffer {
 };
 
 struct anv_subpass {
+   uint32_t                                     attachment_count;
+
+   /**
+    * A pointer to all attachment references used in this subpass.
+    * Only valid if ::attachment_count > 0.
+    */
+   VkAttachmentReference *                      attachments;
    uint32_t                                     input_count;
    VkAttachmentReference *                      input_attachments;
    uint32_t                                     color_count;