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Merging r227809: --------------------------------------------------------------…

Authored by hansw on Feb 2 2015, 1:24 PM.

Description

Merging r227809: ------------------------------------------------------------------------ r227809 | jvoung | 2015-02-02 08:56:50 -0800 (Mon, 02 Feb 2015) | 16 lines

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

llvm-svn: 227864