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

[Sanjoy Das]

Hi majnemer, atrick,

This change moves creating calls to `llvm.uadd.with.overflow` to from
InstCombine to CodeGenPrep.  Combining overflow check patterns into
calls to the said intrinsic in InstCombine inhibits optimization because
it introduces an intrinsic call that not all other transforms and
analyses understand.

Depends on D8888.

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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