K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2020-05-09T17:14:59.210209Z
K 7
svn:log
V 244
MFC 356499: 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.

Sponsored by:	DARPA

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