Fix if statements hoisting, now that send is working

Same same, just have to remembe to actually execute the condition if it is a send
Having send a possible expression, removes one tmp variable and associated move, for a little extra work.
Next return and assign (rest)

lib/vool/statement.rb

@@ -56,6 +56,10 @@ module Vool
       raise "not iplemented in #{self}"
     end
 
+    def at_depth(depth , *strings)
+      prefix = " " * 2 * depth
+      strings.collect{|str| prefix + str}.join("\n")
+    end
   end
 
 end