WIP: Enable inline header generation for RVV #223

Job	Run time
build-native-gcc	4m 0s
build-native-llvm	5m 51s
test-native-gcc	8m 38s
build-aarch64-gcc	4m 53s
test-native-llvm	7m 52s
build-aarch64-llvm	2m 56s
build-armhf-gcc	3m 51s
build-armhf-llvm	4m 29s
build-ppc64el-gcc	3m 43s
build-ppc64el-llvm	3m 53s
build-s390x-gcc	2m 17s
build-s390x-llvm	5m 44s
build-riscv64-llvm	2m 23s
test-aarch64-gcc (qemu_cpu: "max,sve=off")	7m 26s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve128=on")	5m 26s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve256=on")	7m 43s
test-aarch64-gcc (qemu_cpu: "max,sve=on,sve512=on")	7m 39s
test-armhf-gcc (qemu_cpu: "max")	5m 21s
test-armhf-llvm (qemu_cpu: "max")	2m 26s
test-ppc64el-gcc (qemu_cpu: "power10")	2m 51s
test-ppc64el-llvm (qemu_cpu: "power10")	2m 49s
test-s390x-gcc (qemu_cpu: "")	1m 22s
test-s390x-llvm (qemu_cpu: "")	1m 24s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=false")	1m 22s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=128,elen=64,vext_spec=v1.0")	1m 20s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=256,elen=64,vext_spec=v1.0")	1m 21s
test-riscv64-llvm (qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=512,elen=64,vext_spec=v1.0")	1m 22s
	1h 50m 22s

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