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Part of the logic for combining (zext (load ...)) and (sext (load ...)) is duplicated. This creates problems because bugs in one version have to be fixed again in the other version. To address this, as a first step, I've extracted the duplicate logic into a helper. I'll fix the debug location bug in the helper and eliminate the copy of its logic in a followup. Part of: llvm.org/PR37262 Differential Revision: https://reviews.llvm.org/D46157 llvm-svn: 332117
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