to_risc for NotSameCheck

which is only used in call cache checking
some fixing, needed to add a abel for the cache check jump

lib/risc/instructions/branch.rb

@@ -75,6 +75,14 @@ module Risc
     end
   end
 
+  # branch if two registers contain different values
+  class NotSame < Branch
+    attr_reader :left , :right
+    def initialize(source , left , right , label)
+      super(source , label)
+    end
+  end
+
   class Unconditional < Branch
 
   end