Remove MethodReturn instruction

and pass
and fix all tests
move towards removing all vm instructions

lib/virtual/instruction.rb

@@ -16,4 +16,3 @@ end
 require_relative "instructions/halt"
 require_relative "instructions/method_call"
 require_relative "instructions/method_enter"
-require_relative "instructions/method_return"

lib/virtual/instructions/method_return.rb

@@ -1,14 +0,0 @@
-module Virtual
-
-
-  # also the return shuffles our objects beck before actually transferring control
-  class MethodReturn < Instruction
-    def initialize method
-      @method = method
-    end
-
-    attr_reader :method
-
-  end
-
-end

lib/virtual/method_source.rb

@@ -60,7 +60,13 @@ module Virtual
       set_return_type( return_type )
       @blocks = [enter]
       @current = enter
-      new_block("return").add_code(MethodReturn.new(method))
+      ret = new_block("return")
+      # move the current message to new_message
+      ret.add_code Register::RegisterTransfer.new(self, Register.message_reg , Register.new_message_reg )
+      # and restore the message from saved value in new_message
+      ret.add_code Register.get_slot(self,:new_message , :caller , :message )
+      #load the return address into pc, affecting return. (other cpus have commands for this, but not arm)
+      ret.add_code Register::FunctionReturn.new( self , Register.new_message_reg , Register.resolve_index(:message , :return_address) )
       @constants = []
     end
     attr_reader   :blocks , :constants , :return_type