[PATCH] [SimplifyLibCalls] Teach the Fortified libcall simplifier to look through objectsize.

[Ahmed Bougacha]

Hi hfinkel,

It used to only try to fold fortified (_chk) libcalls with a constant objectsize.
However, in most cases, the @llvm.objectsize intrinsic is used.  Teach the
LibCallSimplifier to ask for the objectsize to handle the latter case.

Three-ish (one, really) new optimizations opportunities were created in the tests.

http://reviews.llvm.org/D5984

Files:
  include/llvm/Transforms/Utils/SimplifyLibCalls.h
  lib/Transforms/Utils/SimplifyLibCalls.cpp
  test/CodeGen/X86/2011-02-21-VirtRegRewriter-KillSubReg.ll
  test/Transforms/InstCombine/stpcpy_chk-1.ll
  test/Transforms/InstCombine/strcpy_chk-1.ll
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