Add helperrvv.h inline header defines. #237

Job	Run time
build-native-gcc	3m 15s
build-native-llvm	3m 45s
build-aarch64-gcc	4m 46s
build-aarch64-llvm	3m 20s
test-native-gcc	8m 7s
build-armhf-gcc	2m 16s
test-native-llvm	7m 56s
build-armhf-llvm	1m 38s
build-ppc64el-gcc	5m 56s
build-ppc64el-llvm	3m 2s
build-s390x-gcc	2m 22s
build-s390x-llvm	5m 45s
build-riscv64-llvm	5m 0s
test-${{ matrix.arch }}-${{ matrix.compiler }} (qemu_cpu: "${{ matrix.qemu_cpu }}")	0s
	57m 8s

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