LoongArch: ftrace: Add direct call trampoline samples support
The ftrace samples need per-architecture trampoline implementations to save and restore argument registers around the calls to my_direct_func* and to restore polluted registers (e.g: ra). Signed-off-by:Qing Zhang <zhangqing@loongson.cn> Signed-off-by:
Youling Tang <tangyouling@loongson.cn> Signed-off-by:
Huacai Chen <chenhuacai@loongson.cn>
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