NextBSD/src bd90949sys/arm64/arm64 machdep.c trap.c, sys/arm64/include pcb.h

Add PCB_FP_USERMASK so we can mask off floating point flags that should
not be sent to userspace, for example the future flag to tell when we are
using floating point in the kernel.

Obtained from:  ABT Systems Ltd
Sponsored by:   The FreeBSD Foundation
DeltaFile
+3-1sys/arm64/arm64/machdep.c
+3-0sys/arm64/arm64/trap.c
+2-0sys/arm64/include/pcb.h
+8-13 files

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