Add Lakeroad egglog backend

.gitignore

@@ -45,3 +45,7 @@ __pycache__
 /tests/unit/bintest/
 /tests/unit/objtest/
 /tests/ystests
+
+# lit files
+backends/lakeroad/tests/.lit_test_times.txt
+backends/lakeroad/tests/Output/

backends/lakeroad/Makefile.inc

@@ -0,0 +1,3 @@
+
+OBJS += backends/lakeroad/lakeroad.o
+

backends/lakeroad/example.ys

@@ -0,0 +1,11 @@
+read_verilog <<EOF
+module test(input [1:0] a, input b, output o);
+  assign o = a & b;
+endmodule
+EOF
+
+# Write output to stdout
+write_lakeroad
+# Write output to file.egg
+write_lakeroad file.egg
+!rm file.egg