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DAGCombine will try to fold two loads that feed a SELECT or SELECT_CC after the select, resulting in a select of an address and a single load after. If either of the loads depend on the other, this is not legal as it could introduce cycles. However, it only checked this if the opcode was a SELECT, and not for a SELECT_CC. Unfortunately, the only reproducer I have for this is for our downstream target. I've tried getting it to trigger on an upstream one but haven't been successful. Patch thanks to Bevin Hansson. llvm-svn: 342980
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