sparc64: Fix stack dumping and tracing when function graph is enabled.

Like x86, when the function graph tracer is enabled, emit the ftrace
stub as well as the program counter it will be transformed back into.

We duplicate a lot of similar stack walking logic in 3 or 4 spots, so
eventually we should consolidate things like x86 does.

Thanks to Frederic Weisbecker for pointing this out.

Signed-off-by: David S. Miller <davem@davemloft.net>

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