fixed parsing of constant with comment between size and value

tests/simple/macros.v

@@ -235,3 +235,10 @@ always @* begin
 end
 
 endmodule
+
+`define SIZE 4 // comment supported in this part
+module test ( din_a, dout_a );
+input [`SIZE-1:0] din_a;
+output [`SIZE-1:0] dout_a;
+assign dout_a = din_a | `SIZE'ha;
+endmodule