reconcile RVV vmask types #221

Job	Run time
build-native-gcc	5m 39s
build-native-llvm	4m 14s
build-aarch64-gcc	3m 53s
test-native-gcc	10m 44s
build-aarch64-llvm	5m 58s
test-native-llvm	9m 37s
build-armhf-gcc	2m 28s
build-armhf-llvm	2m 21s
build-ppc64el-gcc	6m 34s
build-ppc64el-llvm	6m 39s
build-s390x-gcc	4m 53s
build-s390x-llvm	2m 21s
build-riscv64-llvm	2m 54s
test-aarch64-gcc (qemu_cpu: "max,sve=off")	17m 5s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve128=on")	22m 32s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve256=on")	25m 19s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve512=on")	24m 9s
test-armhf-gcc (qemu_cpu: "max")	16m 52s
test-armhf-llvm (qemu_cpu: "max")	14m 1s
test-ppc64el-gcc (qemu_cpu: "power10")	13m 48s
test-ppc64el-llvm (qemu_cpu: "power10")	13m 48s
test-s390x-gcc (qemu_cpu: "")	7m 27s
test-s390x-llvm (qemu_cpu: "")	6m 11s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=false")	4m 8s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=128,elen=64,vext_spec=v1.0")	13m 14s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=256,elen=64,vext_spec=v1.0")	8m 48s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=512,elen=64,vext_spec=v1.0")	8m 48s
	4h 24m 25s

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