Fix ARM peephole optimizeCompare to avoid optimizing unsigned cmp to 0.

Fix ARM peephole optimizeCompare to avoid optimizing unsigned cmp to 0.

Summary:
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.

Test Plan: test/CodeGen/ARM/sub-cmp-peephole.ll

Reviewers: jfb, manmanren

Subscribers: aemerson, llvm-commits

Differential Revision: http://reviews.llvm.org/D7274

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227809 91177308-0d34-0410-b5e6-96231b3b80d8