adding cache entry to parfait

lib/parfait/cache_entry.rb

@@ -0,0 +1,17 @@
+# For dynamic calls (ie method calls where the method can not be determined at compile time)
+# we resolve the method at runtime, and then cache it. Aaron has shown that over 99%
+# of call sites are type stable, so one cache entry at the moment
+#
+# A cache entry stores the type of the object and the TypedMethod that is to be called
+# This is used in DynamicCall, see there
+#
+module Parfait
+  class CacheEntry < Object
+    attr :cached_type
+    attr :cached_method
+    def initialize(type , method)
+      @cached_type = type
+      @cached_method = method
+    end
+  end
+end