abc9: holes module to instantiate cells with NEW_ID (#2992)

* Add testcase

* holes module to instantiate cells with NEW_ID

tests/techmap/bug2759.ys

@@ -0,0 +1,14 @@
+read_verilog -specify <<EOT
+(* abc9_box, whitebox *)
+module box(input [1:0] i, output o);
+specify
+(i *> o) = 1;
+endspecify
+assign o = ^i;
+endmodule
+
+module top(input [1:0] i, output o);
+box i1(i, o);
+endmodule
+EOT
+abc9 -lut 4