LoongArch: save one instruction for arch_local_irq_{enable,disable}

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6BWFP



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Signed-off-by: Hongchen Zhang <zhanghongchen@loongson.cn>
Change-Id: I607e48f5abea1184b22326e772d809f6994603cc