stash old vm

moving on to getting mom to work and can’t have both
interpreter and elf broke, about 100 tests  went

stash/vm/method_compiler/operator_expression.rb

@@ -0,0 +1,15 @@
+module Vm
+  module OperatorExpression
+
+    def on_OperatorExpression statement
+      #      operator , left_e , right_e = *statement
+      # left and right must be expressions. Expressions return a register when compiled
+      left_reg = process(statement.left_expression)
+      right_reg = process(statement.right_expression)
+      raise "Not register #{left_reg}" unless left_reg.is_a?(Risc::RiscValue)
+      raise "Not register #{right_reg}" unless right_reg.is_a?(Risc::RiscValue)
+      add_code Risc::OperatorInstruction.new(statement,statement.operator,left_reg,right_reg)
+      return left_reg # though this has wrong value attached
+    end
+  end
+end