Add new tests for Anlogic architecture

Problems/questions:
	- memory.ys: ERROR: Failed to import cell gate.mem.0.0.0 (type
EG_LOGIC_DRAM16X4) to SAT database.
		Why EG_LOGIC_DRAM16X4, not AL_LOGIC_BRAM?
	- Internal cell type $_TBUF_  is present.

tests/anlogic/tribuf.v

@@ -0,0 +1,23 @@
+module tristate (en, i, o);
+    input en;
+    input i;
+    output o;
+
+	assign o = en ? i : 1'bz;
+
+endmodule
+
+
+module top (
+input en,
+input a,
+output b
+);
+
+tristate u_tri (
+        .en (en ),
+        .i (a ),
+        .o (b )
+    );
+
+endmodule