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

[Jan Voung]

Hi jfb, manmanren,

Previously it only avoided optimizing signed comparisons to 0.
Sometimes the DAGCombiner will optimize the unsigned comparisons
to 0 before it gets to the peephole pass, but sometimes it doesn't.

Fix for PR22373.

http://reviews.llvm.org/D7274

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

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