[PATCH] [CallGraph] Teach the CallGraph about non-leaf intrinsics.

[Sanjoy Das]

Hi reames, chandlerc, atrick, pgavlin,

Currently intrinsics don't affect the creation of the call graph.
This is not accurate with respect to statepoint and patchpoint
intrinsics -- these do call (or invoke) LLVM level functions.

This change fixes this inconsistency by adding a call to the external
node for call sites that call these non-leaf intrinsics.  This coupled
with the fact that these intrinsics also escape the function pointer
they call gives us a conservatively correct call graph.

http://reviews.llvm.org/D10526

Files:
  include/llvm/Analysis/CallGraph.h
  include/llvm/IR/Intrinsics.h
  lib/Analysis/IPA/CallGraph.cpp
  lib/Analysis/IPA/CallGraphSCCPass.cpp
  lib/IR/Function.cpp
  test/Analysis/CallGraph/non-leaf-intrinsics.ll

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