Added $anyconst support to yosys-smtbmc

examples/smtbmc/demo5.v

@@ -0,0 +1,18 @@
+// Demo for $anyconst
+
+module demo5 (input clk);
+	wire [7:0] step_size = $anyconst;
+	reg [7:0] state = 0, count = 0;
+	reg [31:0] hash = 0;
+
+	always @(posedge clk) begin
+		count <= count + 1;
+		hash <= ((hash << 5) + hash) ^ state;
+		state <= state + step_size;
+	end
+
+	always @* begin
+		if (count == 42)
+			assert(hash == 32'h A18FAC0A);
+	end
+endmodule