Additional commentary in helperrvv.h (#527) #134

Job	Run time
build-native-gcc	5m 48s
build-native-llvm	6m 53s
test-native-gcc	9m 38s
test-native-llvm	9m 36s
build-aarch64-gcc	3m 42s
build-aarch64-llvm	4m 39s
build-armhf-gcc	3m 55s
build-armhf-llvm	1m 45s
build-ppc64el-gcc	7m 35s
build-ppc64el-llvm	2m 55s
build-s390x-gcc	2m 30s
build-s390x-llvm	5m 46s
build-riscv64-llvm	2m 38s
test-aarch64-gcc (qemu_cpu: "max,sve=off")	16m 55s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve128=on")	21m 43s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve256=on")	29m 19s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve512=on")	29m 45s
test-aarch64-llvm (qemu_cpu: "max,sve=off")	19m 57s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve128=on")	23m 40s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve256=on")	25m 25s
test-aarch64-llvm (qemu_cpu: "max,sve=on,sve512=on")	29m 19s
test-armhf-gcc (qemu_cpu: "max")	14m 34s
test-armhf-llvm (qemu_cpu: "max")	13m 37s
test-ppc64el-gcc (qemu_cpu: "power10")	30m 20s
test-ppc64el-llvm (qemu_cpu: "power10")	27m 45s
test-s390x-gcc (qemu_cpu: "")	21m 21s
test-s390x-llvm (qemu_cpu: "")	20m 47s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=false")	12m 25s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=128,elen=64,vext_spec=v1.0")	29m 46s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=256,elen=64,vext_spec=v1.0")	42m 48s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=512,elen=64,vext_spec=v1.0")	1h 0m 37s
	8h 57m 23s

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