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861489af1b
In RISCVTargetTransformInfo, enumerating the processor family is not a good way to predict. Because it needs to enumerate many subtarget family and is hard to update if add new subtarget. Instead, create a feature to distinguish whether targets want to use default unroll preference or not. Keep TuneSiFive7 because it's flag to indicate subtarget family, which may used in other place. Differential Revision: https://reviews.llvm.org/D125741
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