[PATCH] Refactoring SimplifyLibCalls to remove static initializers and generally cleaning up the code.

[Chris Bieneman]

* Renamed isFoldable to be more descriptive
* Cleaned up constructors and destructors
* Added some comments
* Fixed formatting in a few places where clang-format went a bit nuts

http://reviews.llvm.org/D5364

Files:
  include/llvm/Transforms/Utils/SimplifyLibCalls.h
  lib/Transforms/InstCombine/InstructionCombining.cpp
  lib/Transforms/Utils/SimplifyLibCalls.cpp
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