LoongArch: Add guard for the larch_insn_gen_xxx functions

mainline inclusion
from mainline-v6.5-rc1
commit 0d03e9dc
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7MWTU


CVE: NA

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Add guard for the larch_insn_gen_xxx functions to verify whether the
immediate operand is within the acceptable range.

Signed-off-by: Yongzhen Zhang <zhangyongzhen@kylinos.cn>
Signed-off-by: WANG Rui <wangrui@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>