support fence.i#21

mingyuan-xia wants to merge 2 commits intopetrpavlu:riscv64-linuxpetrpavlu/valgrind-riscv64:riscv64-linuxfrom

ultrarisc:riscv64-linuxultrarisc/valgrind-riscv64:riscv64-linuxCopy head branch name to clipboard