Added Split/Join - not tested

rtl/interfaces/VX_join_inter.v

@@ -0,0 +1,17 @@
+
+`include "../VX_define.v"
+
+`ifndef VX_JOIN_INTER
+
+`define VX_JOIN_INTER
+
+interface VX_join_inter ();
+
+	wire            is_join;
+	wire[`NW_M1:0]  join_warp_num;
+
+
+endinterface
+
+
+`endif