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if this is a mapped/executable region of memory. If it isn't, we've jumped through a bad pointer and we know how to unwind the stack correctly based on the ABI. Previously I had 0x0 special cased but if you jumped to 0x2 on x86_64 one frame would be skipped because the unwinder would try using the x86_64 ArchDefaultUnwindPlan which relied on the rbp. Fixes <rdar://problem/10508291> llvm-svn: 146477