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

[Ahmed Bougacha]

[2/4] [SimplifyLibCalls] Provide a way to only lower fortified calls.

There are currently two versions of the fortified libcall lowering:
this one, and a duplicate in CGP.  The former is more general, with the
latter only lowering fortified libcalls to their non-fortified
instrinsic counterparts.

This patch enables both to be merged, by providing a way to
LibCallSimplifier clients to only enable fortified call lowering.

http://reviews.llvm.org/D5982

Files:
  include/llvm/Target/TargetLibraryInfo.h
  include/llvm/Transforms/Utils/SimplifyLibCalls.h
  lib/Target/TargetLibraryInfo.cpp
  lib/Transforms/Utils/SimplifyLibCalls.cpp
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