Add tests

examples/ir0/simple.ir

@@ -0,0 +1,14 @@
+
+fun i32 @main () {
+init:
+  bid: b0
+  allocations: 
+    %l0:i32:x
+
+block b0:
+  %b0:i0:unit = store 1:i32 %l0:*i32
+  ret 1:i32
+
+block b1:
+  ret 0:i32
+}