K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2020-02-06T21:46:15.171821Z
K 7
svn:log
V 339
Tidy the _set_tp function for RISC-V.

- Use a constant for the offset instead of a magic number.
- Use an addi instruction that writes to tp directly instead of a mv
  that writes the result of a compiler-generated addi.

Reviewed by:	mhorne
MFC after:	1 week
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D23521

END