rvinterf backslash escape: introduce libprint The new helper function library named libprint is meant to replace the badly misnamed libg23, and will soon contain functions for printing all of the same kinds of GPF TST packets that are now handled in libg23. However, we are also moving safe_print_trace() from libasync to this new library, and changing it to emit our new backslash escape format.

	.text
	.code	32
	.globl	memcpy16
memcpy16:
1:	subs	r2, r2, #2
	ldrcsh	r3, [r1], #2
	strcsh	r3, [r0], #2
	bhi	1b
	bx	lr