powerpc/tracing: TRACE_WITH_FRAME_BUFFER creates invalid stack frames
TRACE_WITH_FRAME_BUFFER creates 32 byte stack frames. On ppc64
ABIv1 this is too small and a callee could corrupt the stack by
writing to the parameter save area (starting at offset 48).
Signed-off-by: NAnton Blanchard <anton@samba.org>
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