Mitchell Horne 0ef474de88 amd64: allow gdb(4) to write to most registers
Similar to the recent patch to arm's gdb stub in r368414, allow GDB to
update the contents of most general purpose registers.

Reviewed by:	cem, jhb, markj
MFC after:	2 weeks
Sponsored by:	NetApp, Inc.
Sponsored by:	Klara, Inc.
NetApp PR:	44
Differential Revision:	https://reviews.freebsd.org/D27642
2020-12-18 16:09:24 +00:00
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