[PATCH] ComputeKnownBits: be a bit smarter about ADDs

[escha]

Fix one last test now that I've run all of the CodeGen tests.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10512

Files:
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  test/CodeGen/AArch64/aarch64-dynamic-stack-layout.ll
  test/CodeGen/X86/win64_frame.ll

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