sh: Set the cfa_offset to 0 if we see a DW_CFA_def_cfa_register op
The way that the CFA is calculated can change as we progress through a function. If we see a DW_CFA_def_cfa_register op we need to reset the frame's cfa_offset value which may have been previously setup. Signed-off-by: NMatt Fleming <matt@console-pimps.org> Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
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