Joel Galenson dbc724f764 [ARM] Fix perf regression in compare optimization.
Fix a performance regression caused by r322737.

While trying to make it easier to replace compares with existing adds and
subtracts, I accidentally stopped it from doing so in some cases.  This should
fix that.  I'm also fixing another potential bug in that commit.

Differential Revision: https://reviews.llvm.org/D42263

llvm-svn: 322972
2018-01-19 17:46:27 +00:00
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