Nadav Rotem 368d2e9976 Teach ComputeNumSignBits about signed reminder.
This optimization a continuation of r231140 that reasoned about signed div.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231433 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-06 00:23:58 +00:00
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