[strace/strace] [RFC] Add 64-bit LoongArch support (PR #205)

[Dmitry V. Levin]

>     regs->orig_a0 = regs->regs[4];
>     regs->regs[4] = -ENOSYS;
>     nr = syscall_enter_from_user_mode(regs, nr);

This way the first syscall argument won't be available for ptracers because `regs->orig_a0` is not exposed in `struct user_pt_regs` and not handled by `gpr_get` and `gpr_set`.

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