Abstract the handling of dirty stacked registers in ia64_read_reg() and ia64_write_reg() and call these whenever we read or write registers from and to memory. This way we correctly read registers from addresses in the register cache and thus fixes backtraces when the saved registers (such as rp and ar.pfs) are in dirty stacked registers.
Abstract the handling of dirty stacked registers in ia64_read_reg() and
ia64_write_reg() and call these whenever we read or write registers from
and to memory. This way we correctly read registers from addresses in
the register cache and thus fixes backtraces when the saved registers
(such as rp and ar.pfs) are in dirty stacked registers.

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