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* AMDGPU: Eliminate half of i64 or if one operand is zero_extend from i32Matt Arsenault2016-04-121-0/+41
This helps clean up some of the mess when expanding unaligned 64-bit loads when changed to be promote to v2i32, and fixes situations where or x, 0 was emitted after splitting 64-bit ors during moveToVALU. I think this could be a generic combine but I'm not sure. llvm-svn: 266104
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