PC-BSD/trueos 38d007esys/arm64/arm64 freebsd32_machdep.c elf32_machdep.c, sys/arm64/conf GENERIC

Impleent COMPAT_FREEBSD32 for arm64.
This is based on early work by andrew@.
DeltaFile
+347-8sys/arm64/arm64/freebsd32_machdep.c
+227-6sys/arm64/arm64/elf32_machdep.c
+35-0sys/arm64/arm64/undefined.c
+23-4sys/arm64/arm64/machdep.c
+26-0sys/arm64/include/ucontext.h
+20-5sys/arm64/arm64/vm_machdep.c
+22-2sys/arm64/arm64/identcpu.c
+18-0sys/arm64/arm64/locore.S
+8-0sys/arm64/include/frame.h
+5-1sys/arm64/include/reg.h
+5-0sys/arm64/include/vfp.h
+4-0sys/arm64/include/elf.h
+4-0sys/arm64/include/armreg.h
+1-1sys/arm64/conf/GENERIC
+745-2714 files

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