[PATCH][PM] Add pass run listeners to the pass manager.

Juergen Ributzka juergen at apple.com
Sat Apr 26 16:20:34 PDT 2014

Hi @ll,

this patch provides the necessary C/C++ APIs and infastructure to enable fine-
grain progress report and safe suspension points after each pass in the pass

Clients can provide a callback function to the pass manager to call after each
pass. This can be used in a variety of ways (progress report, dumping of IR
between passes, safe suspension of threads, etc).

The run listener list is maintained in the LLVMContext, which allows a multi-
threaded client to be only informed for it's own thread. This of course assumes
that the client created a LLVMContext for each thread.


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