LoongArch: Mark Clang LTO as working

mainline inclusion
from mainline-v6.5-rc1
commit 5a31ed46
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7MWTU


CVE: NA

--------------------------------

Confirmed working with QEMU system emulation.

Signed-off-by: Yongzhen Zhang <zhangyongzhen@kylinos.cn>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: WANG Xuerui <git@xen0n.name>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>