Changes pertaining to supporting instrumentation:  

* Constructors for easier construction thereof, and also of
  argument vectors for both clean and dirty helpers.

* Allow/require instrumenters to supply helper-lookup functions.

* Clarify situation re whether or not dirty helpers get passed
  a pointer to the guest state.

* Sanity check IR after instrumentation.

Myriad other changes to make this all work.



git-svn-id: svn://svn.valgrind.org/vex/trunk@439 8f6e269a-dfd6-0310-a8e1-e2731360e62c
9 files changed