John Baldwin f5a7e78d32 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
2020-02-06 21:46:15 +00:00
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2020-02-06 21:46:15 +00:00