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

src-test/sys/riscv/include/stack.h, branch release/11.3.0 FreeBSD source tree https://cgit-dev.freebsd.org/src-test/atom?h=release%2F11.3.0 2016-03-10T15:51:43Z Add support for ddb(4). 2016-03-10T15:51:43Z Ruslan Bukin br@FreeBSD.org 2016-03-10T15:51:43Z urn:sha1:d52d6d7ca734cbac90837a7e29462510483b3af2 Sponsored by: DARPA, AFRL Sponsored by: HEIF5