fix many tests with preloading

preloading, something akin to builtin, loads some very small predefined (macro) methods for the tests to work (ie call)

test/mom/send/test_send_dynamic.rb

@@ -5,8 +5,8 @@ module Risc
     include Statements
 
     def setup
-      super
-      @input = "@a.div4"
+      @preload = "Integer.div4"
+      @input = "@classes.div4"
       @expect = [LoadConstant, SlotToReg, SlotToReg, SlotToReg, SlotToReg, #5
                  OperatorInstruction, IsZero, SlotToReg, SlotToReg, SlotToReg, #10
                  LoadConstant, RegToSlot, LoadConstant, LoadConstant, SlotToReg, #15

test/mom/send/test_send_simple.rb

@@ -5,7 +5,7 @@ module Risc
     include Statements
 
     def setup
-      super
+      @preload = "Integer.div4"
       @input = "5.div4"
       @expect =  [LoadConstant, SlotToReg, RegToSlot, LoadConstant, SlotToReg, #5
                  RegToSlot, LoadConstant, SlotToReg, RegToSlot, SlotToReg, #10

test/mom/send/test_send_simple_args.rb

@@ -5,7 +5,7 @@ module Risc
     include Statements
 
     def setup
-      super
+      @preload = "Object.get"
       @input = "5.get_internal_word(1)"
       @expect = [LoadConstant, SlotToReg, RegToSlot, LoadConstant, SlotToReg, #5
                  RegToSlot, LoadConstant, SlotToReg, RegToSlot, LoadConstant, #10

test/mom/send/test_setup_simple.rb

@@ -5,7 +5,7 @@ module Risc
     include Statements
 
     def setup
-      super
+      @preload = "Integer.div4"
       @input = "return 5.div4"
       @expect =  [LoadConstant, SlotToReg, RegToSlot, LoadConstant, SlotToReg, #5
                  RegToSlot, LoadConstant, SlotToReg, RegToSlot, SlotToReg, #10