Fix AArch64 syscall calling convention #65
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The previous code would only read the registers on exit, after the kernel has replaced the first argument with the result of the syscall, preventing us from displaying the correct arguments. It would also read the return code from x8 instead of x0, which contains the syscall number instead.
Makes ee731ca work at all. Also in the future please make reverts and feature additions into different commits.
Fixes #63.