[PATCH] [InstCombine][CodeGenPrep] Create llvm.uadd.with.overflow in CGP.

[Sanjoy Das]

Address David's comments:

- introduce m_Instruction and use it
- fix comment


http://reviews.llvm.org/D8889

Files:
  include/llvm/IR/PatternMatch.h
  lib/CodeGen/CodeGenPrepare.cpp
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  test/CodeGen/X86/add-of-carry.ll
  test/Transforms/CodeGenPrepare/overflow-intrinsics.ll
  test/Transforms/InstCombine/overflow.ll

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