Refactor ScriptData class for cached compile data.

src/messages.js

Index: src/messages.js
diff --git a/src/messages.js b/src/messages.js
index e3d941b0395a94b93988a0e2d3ad69e56ae877e1..815f97a0fbf8b84f41f2520fe62544729c847e2f 100644
--- a/src/messages.js
+++ b/src/messages.js
@@ -137,8 +137,6 @@ var kMessages = {
   array_indexof_not_defined:     ["Array.getIndexOf: Argument undefined"],
   object_not_extensible:         ["Can't add property ", "%0", ", object is not extensible"],
   illegal_access:                ["Illegal access"],
-  invalid_cached_data_function:  ["Invalid cached data for function ", "%0"],
-  invalid_cached_data:           ["Invalid cached data"],
   strict_mode_with:              ["Strict mode code may not include a with statement"],
   strict_eval_arguments:         ["Unexpected eval or arguments in strict mode"],
   too_many_arguments:            ["Too many arguments in function call (only 65535 allowed)"],