Add helperrvv.h inline header defines. #231

Job	Run time
build-native-gcc	5m 1s
build-native-llvm	3m 47s
test-native-gcc	9m 58s
test-native-llvm	7m 56s
build-aarch64-gcc	6m 1s
build-aarch64-llvm	5m 4s
build-armhf-gcc	3m 31s
build-armhf-llvm	4m 15s
build-ppc64el-gcc	5m 42s
build-ppc64el-llvm	4m 57s
build-s390x-gcc	3m 48s
build-s390x-llvm	4m 1s
build-riscv64-llvm	5m 31s
test-aarch64-gcc (qemu_cpu: "max,sve=off")	20m 45s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve128=on")	22m 27s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve256=on")	27m 19s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve512=on")	33m 18s
test-aarch64-llvm (qemu_cpu: "max,sve=off")	16m 14s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve128=on")	23m 40s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve256=on")	25m 29s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve512=on")	32m 17s
test-armhf-gcc (qemu_cpu: "max")	16m 45s
test-armhf-llvm (qemu_cpu: "max")	14m 12s
test-ppc64el-gcc (qemu_cpu: "power10")	26m 36s
test-ppc64el-llvm (qemu_cpu: "power10")	25m 5s
test-s390x-gcc (qemu_cpu: "")	19m 50s
test-s390x-llvm (qemu_cpu: "")	18m 10s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=false")	12m 28s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=128,elen=64,vext_spec=v1.0")	33m 51s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=256,elen=64,vext_spec=v1.0")	42m 52s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=512,elen=64,vext_spec=v1.0")	1h 3m 7s
	9h 3m 57s

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