andrew f0c954c605 Implement single stepping on arm64. We need to set the single step bits in
the processor and debug state registers. A flag has been added to the pcb
to tell us when to enable single stepping for a given thread.

Reviewed by:	kib
Sponsored by:	ABT Systems Ltd
Differential Revision:	https://reviews.freebsd.org/D4730
2016-02-02 10:28:56 +00:00
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