removing builtin as a concept (wip)

the "old" way of generating compilers is now obsolete
we can use ruby code with mom macros to achieve the same
Three step wip
remove old builtin
fix tests (including adding necessary methods)
fixup and inclusion of builtin code to parfait

lib/mom/macro/div4.rb

@@ -1,21 +1,4 @@
 module Mom
-  module Builtin
-    class Div4 < ::Mom::Instruction
-      def to_risc(compiler)
-        builder = compiler.builder(compiler.source)
-        integer_tmp = builder.allocate_int
-        builder.build do
-          integer_self! << message[:receiver]
-          integer_self.reduce_int
-          integer_1! << 2
-          integer_self.op :>> , integer_1
-          integer_tmp[Parfait::Integer.integer_index] << integer_self
-          message[:return_value] << integer_tmp
-        end
-        return compiler
-      end
-    end
-  end
   class Div4 < Macro
     def to_risc(compiler)
       builder = compiler.builder(compiler.source)