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Add support for ifunc selection based on CPUID register. Neoverse N1 supports atomic 128-bit load/store, so use the FEAT_USCAT ifunc like newer Neoverse cores. Reviewed-by: Kyrylo.Tkachov@arm.com libatomic: * config/linux/aarch64/host-config.h (ifunc1): Use CPUID in ifunc selection.