dgllvmslicer: include also llvm-slicer-crit.cpp
dgllvmslicer: include also llvm-slicer-crit.cpp

So that other projects can use our parsing capabilties.
In the future, we could create some builder library
that would include parsing and building stuff...

mchalupa/dg,mchalupa/dg,mchalupa/dg,mchalupa/dg