[aarch64-port-dev ] Weird code in generate_call_stub()

[Andrew Haley]

I want to delete this code.  As far as I can see it doesn't do
anything useful.

// AED: this should fix Ed's problem -- we only save the sender's SP for our sim
#ifdef BUILTIN_SIM
    // Save sender's SP for stack traces.
// ECN: FIXME
// #if 0
    __ mov(rscratch1, sp);
    __ str(rscratch1, Address(__ pre(sp, -2 * wordSize)));
#endif

Andrew Dinn?  Ed?  What say you?

Andrew.