src-test/sys/riscv/include/md_var.h, branch release/11.3.0

src-test/sys/riscv/include/md_var.h, branch release/11.3.0 FreeBSD source tree https://cgit-dev.freebsd.org/src-test/atom?h=release%2F11.3.0 2015-12-17T18:44:30Z Import RISC-V machine headers. This is a minimal set required to compile 2015-12-17T18:44:30Z Ruslan Bukin br@FreeBSD.org 2015-12-17T18:44:30Z urn:sha1:8d7e7a98dba43452c9aad66017a1f6a1f62df9fa kernel and userland. Reviewed by: andrew, imp, kib Sponsored by: DARPA, AFRL Sponsored by: HEIF5 Differential Revision: https://reviews.freebsd.org/D4554