reconcile RVV vmask types #226

Job	Run time
build-native-gcc	5m 51s
build-native-llvm	6m 3s
test-native-gcc	10m 42s
test-native-llvm	7m 16s
build-aarch64-gcc	5m 46s
build-aarch64-llvm	6m 8s
build-armhf-gcc	3m 18s
build-armhf-llvm	6m 55s
build-ppc64el-gcc	8m 8s
build-ppc64el-llvm	5m 6s
build-s390x-gcc	4m 59s
build-s390x-llvm	4m 2s
build-riscv64-llvm	4m 52s
test-aarch64-gcc (qemu_cpu: "max,sve=off")	20m 54s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve128=on")	24m 37s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve256=on")	28m 23s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve512=on")	30m 17s
test-aarch64-llvm (qemu_cpu: "max,sve=off")	16m 12s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve128=on")	24m 33s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve256=on")	25m 32s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve512=on")	33m 21s
test-armhf-gcc (qemu_cpu: "max")	17m 49s
test-armhf-llvm (qemu_cpu: "max")	13m 24s
test-ppc64el-gcc (qemu_cpu: "power10")	26m 1s
test-ppc64el-llvm (qemu_cpu: "power10")	24m 35s
test-s390x-gcc (qemu_cpu: "")	19m 25s
test-s390x-llvm (qemu_cpu: "")	21m 39s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=false")	6m 52s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=128,elen=64,vext_spec=v1.0")	16m 48s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=256,elen=64,vext_spec=v1.0")	20m 22s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=512,elen=64,vext_spec=v1.0")	34m 31s
	8h 4m 21s

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