[PATCH] Refactor fortified (__*_chk) library function handling in TLI/LibCallSimplifier.

[Ahmed Bougacha]

Reworked the patch series into just factoring out the fortified stuff into a separate class.
So this now depends on D6179. The rest (tiny NFC stuff) I'll commit directly once these two are upstream.

If it's too unwieldy to review I think it's feasible to split it into three patches.

http://reviews.llvm.org/D5982

Files:
  include/llvm/Transforms/Utils/BuildLibCalls.h
  include/llvm/Transforms/Utils/SimplifyLibCalls.h
  lib/CodeGen/CodeGenPrepare.cpp
  lib/Transforms/Utils/BuildLibCalls.cpp
  lib/Transforms/Utils/SimplifyLibCalls.cpp
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