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Clang on LoongArch (18+) appears to be unaffected by the bug causing excessive stack usage in calculate_bandwidth(). But when building DC_FP support the stack frame size can be as large as 2816 bytes, which causes the FRAME_WARN build warnings. So on LoongArch we allow building DC with clang, but disable DC_FP by default. The help message is also updated. Tested-by: Rui Wang <wangrui@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>