[PATCH] An analysis to find external function pointers and trace their data flow

[Tom Roeder]

  This diff makes changes as suggested by the last review. In summary:

  - Fixed the minor points noted in JF's comments
  - C++11-ified loops and such. Please let me know if there's other C++11-ification I should do here
  - Switched to using TargetLibraryInfo instead of hardcoded strings to check for memory-allocation functions.
  - Switched to using LLVM ADT as much as possible; I still need std::list in a couple places for the iterator guarantees it gives
  - The switch to C++11 range loops forced a bunch of const throughout the code. This probably should have been there in the first place.
  - Added explanatory docs on the class.

http://llvm-reviews.chandlerc.com/D2873

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2873?vs=7326&id=7781#toc

Files:
  include/llvm/Analysis/ExternalFunctionAnalysis.h
  include/llvm/InitializePasses.h
  lib/Analysis/Analysis.cpp
  lib/Analysis/CMakeLists.txt
  lib/Analysis/ExternalFunctionAnalysis.cpp
  test/Analysis/ExternalFunctionAnalysis/external_function_analysis.ll
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