support arm64 register dumps

[huaihuaiVV]

there is arm64 architecture from phone5s
could you add to support show arm6 register ?
Thanks

General Purpose Registers:
x0 = 0x0000000000000000
x1 = 0x0000000007000806
x2 = 0x0000000000000000
x3 = 0x0000000000000c00
x4 = 0x0000000000001c03
x5 = 0x00000000ffffffff
x6 = 0x0000000000000000
x7 = 0x00000001020fc68b "-[WCUploadMgr TryStartTask]"
x8 = 0x00000000fffffbbf
x9 = 0x0000000007000000
x10 = 0x0000000007000100
x11 = 0x00000000000021a8
x12 = 0x0000000000000000
x13 = 0x0000000000000000
x14 = 0x0000000000000000
x15 = 0x0000000000000000
x16 = 0xffffffffffffffe1
x17 = 0x00000001840717a4 CoreFoundation-[__NSArrayM count] x18 = 0x0000000000000000 x19 = 0x0000000000000000 x20 = 0x00000000ffffffff x21 = 0x0000000000001c03 x22 = 0x0000000000000c00 x23 = 0x000000016fd7ec58 x24 = 0x0000000007000806 x25 = 0x0000000000000000 x26 = 0x0000000007000806 x27 = 0x0000000010004004 x28 = 0x0000000000000001 fp = 0x000000016fd7eb50 lr = 0x0000000196908c88 libsystem_kernel.dylibmach_msg + 72
sp = 0x000000016fd7eb00
pc = 0x0000000196908e0c libsystem_kernel.dylib`mach_msg_trap + 8
cpsr = 0x60000000

[deroko]

Will add this asap, tnx for pointing it out.