pass return integer back out through exit

for testing of binaries later (and off course general correctness)
Some tests were using the fact that the interpreter was used, changed those to return ints rather than strings

test/risc/interpreter/calling/test_plus.rb

@@ -23,10 +23,9 @@ module Risc
              SlotToReg, SlotToReg, SlotToReg, FunctionReturn, SlotToReg,
              SlotToReg, RegToSlot, SlotToReg, SlotToReg, RegToSlot,
              SlotToReg, SlotToReg, RegToSlot, SlotToReg, SlotToReg,
-             SlotToReg, Branch, FunctionReturn, Transfer, Syscall,
-             NilClass]
-       assert_equal Parfait::Integer , get_return.class
-       assert_equal 10 , get_return.value
+             SlotToReg, Branch, FunctionReturn, SlotToReg, SlotToReg,
+             Branch, Transfer, Syscall, NilClass]
+       assert_equal 10 , get_return
     end
     def test_load_5
       lod = main_ticks( 20 )
@@ -103,7 +102,7 @@ module Risc
       assert_equal :r4 , sl.register.symbol
     end
     def test_sys
-      sys = main_ticks(65)
+      sys = main_ticks(68)
       assert_equal Syscall ,  sys.class
       assert_equal :exit ,  sys.name
     end