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when call is for mem barrier, called function object is null

* Partially implemented.

* This version runs successfully on server.
  * Upto prefetch insertion step done.

* Add check for flow state NULL

* Contains pass pipeline for tas.

* Pass simple test case.

* not tested yet.

Adapter block = [collector + distributor]

* Fix works, not tested with running code.

* Handle loop which is not in canonical form
* Helper fn runOpt()
* add test case - failing

* Update getAnnotatedFnList api