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

[Ahmed Bougacha]

[4/4] Fix stpcpy support when building st*cpy libcalls.

Check that the stpcpy/stpncpy libcalls are actually available
before generating them.
Also, set the correct name on the return value rather than always
strncpy.

http://reviews.llvm.org/D5982

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