K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2020-01-08T17:25:59.683527Z
K 7
svn:log
V 332
Use clang and lld as the default toolchain for RISCV.

- Enable clang and lld as system toolchains.
- Don't use external GCC for universe by default.
- Re-enable riscv64sf since it builds fine with clang + lld.

Reviewed by:	emaste, mhorne
Relnotes:	yes
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D23089

END