Integrate RISC-V support #7

Job	Run time
build-native-gcc	6m 0s
build-native-llvm	3m 10s
test-native-gcc	15m 18s
test-native-llvm	8m 4s
build-aarch64-gcc	3m 5s
build-aarch64-llvm	5m 52s
build-armhf-gcc	3m 57s
build-armhf-llvm	2m 15s
build-ppc64el-gcc	1m 59s
build-ppc64el-llvm	6m 46s
build-s390x-gcc	1m 53s
build-s390x-llvm	2m 59s
build-riscv64-llvm	1m 34s
test-aarch64-gcc (qemu_cpu: "max,sve=off")	15m 11s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve128=on")	25m 42s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve256=on")	20m 29s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve512=on")	20m 46s
test-armhf-gcc (qemu_cpu: "max")	8m 28s
test-armhf-llvm (qemu_cpu: "max")	8m 21s
test-ppc64el-gcc (qemu_cpu: "power10")	17m 12s
test-ppc64el-llvm (qemu_cpu: "power10")	19m 18s
test-s390x-gcc (qemu_cpu: "")	14m 9s
test-s390x-llvm (qemu_cpu: "")	13m 3s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=false")	7m 4s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=128,elen=64,vext_spec=v1.0")	6m 19s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=256,elen=64,vext_spec=v1.0")	8m 8s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=512,elen=64,vext_spec=v1.0")	6m 57s
	4h 13m 59s

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