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

[Sanjoy Das]

Address Andy's review:

- do the transform only if the call to `uadd.with.overflow` can be inserted in the same basic block as the compare.  This prevents us from moving flag-producing instructions.
- try sinking an icmp before trying to combine it.
- add test cases that exercise both of the above.


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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