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27e4da93b6
Analyze GEPs. If the indices are all zero, transfer whether the pointer is known to be not null through the GEP. Add a few more cases for xor and shift instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35257 91177308-0d34-0410-b5e6-96231b3b80d8
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