Mitchell Horne e152c88273 arm64: add definition for IS_SSTEP_TRAP()
arm64 has a distinct exception code for single-step, so we can use this
to detect when an unexpected SS trap is encountered, or when an expected
one is not. See db_stop_at_pc().

Reviewed by:	markj, jhb
MFC after:	5 days
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D28942
2021-03-01 10:04:23 -04:00
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