tools/perf: Add basic support for LoongArch

Add basic support for LoongArch, which is very similar to the MIPS
version.

Signed-off-by: Ming Wang <wangming01@loongson.cn>
Signed-off-by: Huacai Chen

tools/perf: Add basic support for LoongArch

Add basic support for LoongArch, which is very similar to the MIPS
version.

Signed-off-by: Ming Wang <wangming01@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

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