adds statements test code

tests/icnif/tencode_node2node.nim

@@ -331,3 +331,4 @@ testNifEncDec(graph, "modtestliterals.nim")
 testNifEncDec(graph, "modtesttypesections.nim")
 testNifEncDec(graph, "modtestpragmas.nim")
 testNifEncDec(graph, "modtestprocs.nim")
+testNifEncDec(graph, "modteststatements.nim")

tests/icnif/testcode/modteststatements.nim

@@ -0,0 +1,44 @@
+var stmtListExpr = (echo "foo"; 111)
+
+if false:
+  discard
+elif false:
+  discard
+else:
+  discard
+
+var caseExpr = true
+case caseExpr
+of true:
+  discard
+else:
+  discard
+
+when sizeof(int) == 2:
+  echo "running on a 16 bit system!"
+elif sizeof(int) == 4:
+  echo "running on a 32 bit system!"
+elif sizeof(int) == 8:
+  echo "running on a 64 bit system!"
+else:
+  echo "cannot happen!"
+
+while true:
+  break
+
+var x = 2
+
+while x != 0:
+  if x == 2:
+    x = 0
+    continue
+  else:
+    break
+
+block testblock:
+  while true:
+    if x > -1:
+      break testblock
+
+for i in 0 .. 3:
+  discard i