thread mask redesign

hw/rtl/VX_warp_sched.v

@@ -16,6 +16,8 @@ module VX_warp_sched #(
     VX_ifetch_rsp_if    ifetch_rsp_if,
     VX_ifetch_req_if    ifetch_req_if,
 
+    VX_fetch_to_csr_if  fetch_to_csr_if,
+
     output wire         busy
 );
 
@@ -153,6 +155,9 @@ module VX_warp_sched #(
         end
     end
 
+    // export thread mask register
+    assign fetch_to_csr_if.thread_masks = thread_masks;
+
     // calculate active barrier status
 
 `IGNORE_UNUSED_BEGIN