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ia64: Allow write-access to UNW_IA64_BSP and UNW_IA64_SP.
Writing UNW_IA64_BSP and UNW_IA64_SP can wreak havoc if not done properly but can also be extremely useful when done correctly. For example, the Linux kernel can use this to update a cursor with the MIN_STATE info which is saved by firmware due to an MCA or INIT event. BKrev: 428e03020AqYSMZEt1Q3cCPH0Bj2eA
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