[PATCH] Fix ARM peephole optimizeCompare to avoid optimizing unsigned cmp to 0.

[Jan Voung]

Apply JF's review suggestion -- annotate the switch cases w/ the bits used.


http://reviews.llvm.org/D7274

Files:
  lib/Target/ARM/ARMBaseInstrInfo.cpp
  test/CodeGen/ARM/sub-cmp-peephole.ll

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