Reworking if statement

Using 2 phase approach
Flattening tbd

lib/mom/instruction.rb

@@ -2,10 +2,17 @@ module Mom
 
   # Base class for MOM instructions
   class Instruction
+    attr :next_instruction
+
+    # flattening will change the structure from a tree to a linked list (and use
+    # next_instruction to do so)
+    def flatten
+      raise "not implemented"
+    end
   end
 
-  # basically a label
-  class Noop
+  # A label with a name
+  class Label
     attr_reader :name
     def initialize(name)
       @name = name
@@ -16,6 +23,7 @@ module Mom
 end
 
 require_relative "simple_call"
+require_relative "if_statement"
 require_relative "truth_check"
 require_relative "jump"
 require_relative "slot_load"