move mom instruction up one

just like the risc one, also some basic tests

lib/mom/instruction/instruction.rb

@@ -1,44 +0,0 @@
-module Mom
-
-  # Base class for MOM instructions
-  # At the base class level instructions are a linked list.
-  #
-  # Mom::Instructions are created by the Vool level as an intermediate step
-  # towards the next level down, the Risc level.
-  # Mom and Risc are both abstract machines (ie have instructions), so both
-  # share the linked list functionality (In Util::List)
-  #
-  # To convert a Mom instruction to it's Risc equivalent to_risc is called
-  #
-  class Instruction
-    include Util::List
-
-    # to_risc, like the name says, converts the instruction to it's Risc equivalent.
-    # The Risc machine is basically a simple register machine (kind of arm).
-    # In other words Mom is the higher abstraction and so mom instructions convert
-    # to many (1-10) risc instructions
-    #
-    # The argument that is passed is a MethodCompiler, which has the method and some
-    # state about registers used. (also provides helpers to generate risc instructions)
-    def to_risc(compiler)
-      raise self.class.name + "_todo"
-    end
-  end
-
-end
-
-require_relative "label"
-require_relative "check"
-require_relative "basic_values"
-require_relative "simple_call"
-require_relative "dynamic_call"
-require_relative "block_yield"
-require_relative "resolve_method"
-require_relative "truth_check"
-require_relative "not_same_check"
-require_relative "jump"
-require_relative "return_jump"
-require_relative "slot_load"
-require_relative "return_sequence"
-require_relative "message_setup"
-require_relative "argument_transfer"