Andy Lutomirski approached me to tell me that the syscall_get_arguments()

implementation in x86 was horrible and gcc  certainly gets it wrong. He
said that since the tracepoints only pass in 0 and 6 for i and n repectively,
it should be optimized for that case. Inspecting the kernel, I discovered
that all users pass in 0 for i and only one file passing in something other
than 6 for the number of arguments. That code happens to be my own code used
for the special syscall tracing. That can easily be converted to just
using 0 and 6 as well, and only copying what is needed. Which is probably
the faster path anyway for that case.

Along the way, a couple of real fixes came from this as the
syscall_get_arguments() function was incorrect for csky and riscv.

x86 has been optimized to for the new interface that removes the variable
number of arguments, but the other architectures could still use some
loving and take more advantage of the simpler interface.
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