Add if statements

lambdas.kl

@@ -1,5 +1,18 @@
 
+if_stmt :: (cond: int): int
+  CONSTANT :: 10
+
+  if      cond + CONSTANT
+    return cond + CONSTANT
+  else if cond - CONSTANT
+    return cond - CONSTANT
+  else
+    return CONSTANT
+
+
 add_10 :: (size: int): int
+  // @todo: before the generation c pass, each stage should have it's own
+  //        tree transformation phase, where it yanks functions etc.
   add_20 :: (new_size: int): int
     return 20
 
@@ -13,3 +26,4 @@ return_constant :: (): int
 returning_void :: (insert: int)
   return
 
+