code: def _make_callsites(self, stack_pointer_tracker=None):
          
  
          # Computing reaching definitions
          rd = self.project.analyses.ReachingDefinitions(func=self.function, func_graph=self.graph, observe_all=True)
  
          for key in self._blocks:
              block = self._blocks[key]
              csm = self.project.analyses.AILCallSiteMaker(block, reaching_definitions=rd)
              if csm.result_block:
                  ail_block = csm.result_block
                  simp = self.project.analyses.AILBlockSimplifier(ail_block, stack_pointer_tracker=stack_pointer_tracker)
                  self._blocks[key] = simp.result_block
  
          self._update_graph()
docs: Simplify all function call statements.
  
          :return:    None