fix constant propagation through the layers

so they can end up in the binary

lib/risc/assembler.rb

@@ -1,10 +1,10 @@
 module Risc
   class Assembler
-    attr_reader :method , :instructions , :constants
-    def initialize( method , instructions, constants)
+    attr_reader :method , :instructions
+
+    def initialize( method , instructions)
       @method = method
       @instructions = instructions
-      @constants = constants
       total = instructions.total_byte_length / 4 + 1
       method.binary.extend_to( total )
     end