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/assign/test_assign_ivar_const.rb

@@ -5,8 +5,7 @@ module Risc
     include Statements
 
     def setup
-      super
-      @input = "@ivar = 5;return"
+      @input = "@nil_object = 5;return"
       @expect = [LoadConstant, SlotToReg, RegToSlot, LoadConstant, RegToSlot, Branch]
     end
 

test/mom/assign/test_assign_local_arg.rb

@@ -5,7 +5,6 @@ module Risc
     include Statements
 
     def setup
-      super
       @input = "local = arg; return local"
       @expect = [SlotToReg, RegToSlot, SlotToReg, RegToSlot, Branch] #4
     end

test/mom/assign/test_assign_local_false.rb

@@ -5,7 +5,6 @@ module Risc
     include Statements
 
     def setup
-      super
       @input = "r = false;return"
       @expect = [LoadConstant, RegToSlot,LoadConstant, RegToSlot, Branch]
     end

test/mom/assign/test_assign_local_int.rb

@@ -5,7 +5,6 @@ module Risc
     include Statements
 
     def setup
-      super
       @input = "r = 5;return"
       @expect = [LoadConstant, RegToSlot, LoadConstant, RegToSlot, Branch]
     end

test/mom/assign/test_assign_local_ivar.rb

@@ -5,8 +5,7 @@ module Risc
     include Statements
 
     def setup
-      super
-      @input = "@ivar = 5 ; r = @ivar;return"
+      @input = "@nil_object = 5 ; r = @nil_object;return"
       @expect = [LoadConstant, SlotToReg, RegToSlot, SlotToReg, SlotToReg, #4
                  RegToSlot, LoadConstant, RegToSlot, Branch] #9
     end

test/mom/assign/test_assign_local_send.rb

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